diff --git a/include/cppflow/span.h b/include/cppflow/span.h
new file mode 100644
index 0000000..4248966
--- /dev/null
+++ b/include/cppflow/span.h
@@ -0,0 +1,570 @@
+// <brief>
+
+/*
+ * This is an implementation of C++20's std::span
+ * http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/n4820.pdf
+ */
+
+//          Copyright Tristan Brindle 2018.
+// Distributed under the Boost Software License, Version 1.0.
+//    (See accompanying file ../../LICENSE_1_0.txt or copy at
+//          https://www.boost.org/LICENSE_1_0.txt)
+
+#pragma once
+
+#include <array>
+#include <cstddef>
+#include <cstdint>
+#include <type_traits>
+
+#ifndef TCB_SPAN_NO_EXCEPTIONS
+// Attempt to discover whether we're being compiled with exception support
+#if !(defined(__cpp_exceptions) || defined(__EXCEPTIONS) || defined(_CPPUNWIND))
+#define TCB_SPAN_NO_EXCEPTIONS
+#endif
+#endif
+
+#ifndef TCB_SPAN_NO_EXCEPTIONS
+#include <cstdio>
+#include <stdexcept>
+#endif
+
+// Various feature test macros
+
+#ifndef TCB_SPAN_NAMESPACE_NAME
+#define TCB_SPAN_NAMESPACE_NAME cppflow
+#endif
+
+#if __cplusplus >= 201703L || (defined(_MSVC_LANG) && _MSVC_LANG >= 201703L)
+#define TCB_SPAN_HAVE_CPP17
+#endif
+
+#if __cplusplus >= 201402L || (defined(_MSVC_LANG) && _MSVC_LANG >= 201402L)
+#define TCB_SPAN_HAVE_CPP14
+#endif
+
+namespace TCB_SPAN_NAMESPACE_NAME {
+
+// Establish default contract checking behavior
+#if !defined(TCB_SPAN_THROW_ON_CONTRACT_VIOLATION) &&                          \
+    !defined(TCB_SPAN_TERMINATE_ON_CONTRACT_VIOLATION) &&                      \
+    !defined(TCB_SPAN_NO_CONTRACT_CHECKING)
+#if defined(NDEBUG) || !defined(TCB_SPAN_HAVE_CPP14)
+#define TCB_SPAN_NO_CONTRACT_CHECKING
+#else
+#define TCB_SPAN_TERMINATE_ON_CONTRACT_VIOLATION
+#endif
+#endif
+
+#if defined(TCB_SPAN_THROW_ON_CONTRACT_VIOLATION)
+    struct contract_violation_error : std::logic_error {
+        explicit contract_violation_error(const char* msg) : std::logic_error(msg)
+        {}
+    };
+
+    inline void contract_violation(const char* msg)
+    {
+        throw contract_violation_error(msg);
+    }
+
+#elif defined(TCB_SPAN_TERMINATE_ON_CONTRACT_VIOLATION)
+    [[noreturn]] inline void contract_violation(const char* /*unused*/)
+    {
+        std::terminate();
+    }
+#endif
+
+#if !defined(TCB_SPAN_NO_CONTRACT_CHECKING)
+#define TCB_SPAN_STRINGIFY(cond) #cond
+#define TCB_SPAN_EXPECT(cond)                                                  \
+    cond ? (void) 0 : contract_violation("Expected " TCB_SPAN_STRINGIFY(cond))
+#else
+#define TCB_SPAN_EXPECT(cond)
+#endif
+
+#if defined(TCB_SPAN_HAVE_CPP17) || defined(__cpp_inline_variables)
+#define TCB_SPAN_INLINE_VAR inline
+#else
+#define TCB_SPAN_INLINE_VAR
+#endif
+
+#if defined(TCB_SPAN_HAVE_CPP14) ||                                            \
+    (defined(__cpp_constexpr) && __cpp_constexpr >= 201304)
+#define TCB_SPAN_HAVE_CPP14_CONSTEXPR
+#endif
+
+#if defined(TCB_SPAN_HAVE_CPP14_CONSTEXPR)
+#define TCB_SPAN_CONSTEXPR14 constexpr
+#else
+#define TCB_SPAN_CONSTEXPR14
+#endif
+
+#if defined(TCB_SPAN_HAVE_CPP14_CONSTEXPR) &&                                  \
+    (!defined(_MSC_VER) || _MSC_VER > 1900)
+#define TCB_SPAN_CONSTEXPR_ASSIGN constexpr
+#else
+#define TCB_SPAN_CONSTEXPR_ASSIGN
+#endif
+
+#if defined(TCB_SPAN_NO_CONTRACT_CHECKING)
+#define TCB_SPAN_CONSTEXPR11 constexpr
+#else
+#define TCB_SPAN_CONSTEXPR11 TCB_SPAN_CONSTEXPR14
+#endif
+
+#if defined(TCB_SPAN_HAVE_CPP17) || defined(__cpp_deduction_guides)
+#define TCB_SPAN_HAVE_DEDUCTION_GUIDES
+#endif
+
+#if defined(TCB_SPAN_HAVE_CPP17) || defined(__cpp_lib_byte)
+#define TCB_SPAN_HAVE_STD_BYTE
+#endif
+
+#if defined(TCB_SPAN_HAVE_CPP17) || defined(__cpp_lib_array_constexpr)
+#define TCB_SPAN_HAVE_CONSTEXPR_STD_ARRAY_ETC
+#endif
+
+#if defined(TCB_SPAN_HAVE_CONSTEXPR_STD_ARRAY_ETC)
+#define TCB_SPAN_ARRAY_CONSTEXPR constexpr
+#else
+#define TCB_SPAN_ARRAY_CONSTEXPR
+#endif
+
+#ifdef TCB_SPAN_HAVE_STD_BYTE
+    using byte = std::byte;
+#else
+    using byte = unsigned char;
+#endif
+
+#if defined(TCB_SPAN_HAVE_CPP17)
+#define TCB_SPAN_NODISCARD [[nodiscard]]
+#else
+#define TCB_SPAN_NODISCARD
+#endif
+
+TCB_SPAN_INLINE_VAR constexpr std::size_t dynamic_extent = SIZE_MAX;
+
+template <typename ElementType, std::size_t Extent = dynamic_extent>
+class span;
+
+namespace detail {
+
+template <typename E, std::size_t S>
+struct span_storage {
+    constexpr span_storage() noexcept = default;
+
+    constexpr span_storage(E* p_ptr, std::size_t /*unused*/) noexcept
+        : ptr(p_ptr)
+        {}
+
+    E* ptr = nullptr;
+    static constexpr std::size_t size = S;
+};
+
+template <typename E>
+struct span_storage<E, dynamic_extent> {
+    constexpr span_storage() noexcept = default;
+
+    constexpr span_storage(E* p_ptr, std::size_t p_size) noexcept
+        : ptr(p_ptr), size(p_size)
+        {}
+
+    E* ptr = nullptr;
+    std::size_t size = 0;
+};
+
+// Reimplementation of C++17 std::size() and std::data()
+#if defined(TCB_SPAN_HAVE_CPP17) ||                                            \
+defined(__cpp_lib_nonmember_container_access)
+using std::data;
+using std::size;
+#else
+template <class C>
+constexpr auto size(const C& c) -> decltype(c.size()) {
+    return c.size();
+}
+
+template <class T, std::size_t N>
+constexpr std::size_t size(const T (&)[N]) noexcept {
+    return N;
+}
+
+template <class C>
+constexpr auto data(C& c) -> decltype(c.data()) {
+    return c.data();
+}
+
+template <class C>
+constexpr auto data(const C& c) -> decltype(c.data()) {
+    return c.data();
+}
+
+template <class T, std::size_t N>
+constexpr T* data(T (&array)[N]) noexcept {
+    return array;
+}
+
+template <class E>
+constexpr const E* data(std::initializer_list<E> il) noexcept {
+    return il.begin();
+}
+#endif // TCB_SPAN_HAVE_CPP17
+
+#if defined(TCB_SPAN_HAVE_CPP17) || defined(__cpp_lib_void_t)
+using std::void_t;
+#else
+template <typename...>
+using void_t = void;
+#endif
+
+template <typename T>
+using uncvref_t =
+typename std::remove_cv<typename std::remove_reference<T>::type>::type;
+
+template <typename>
+struct is_span : std::false_type {};
+
+template <typename T, std::size_t S>
+struct is_span<span<T, S>> : std::true_type {};
+
+template <typename>
+struct is_std_array : std::false_type {};
+
+template <typename T, std::size_t N>
+struct is_std_array<std::array<T, N>> : std::true_type {};
+
+template <typename, typename = void>
+struct has_size_and_data : std::false_type {};
+
+template <typename T>
+struct has_size_and_data<T, void_t<decltype(detail::size(std::declval<T>())),
+decltype(detail::data(std::declval<T>()))>>
+    : std::true_type {};
+
+template <typename C, typename U = uncvref_t<C>>
+struct is_container {
+    static constexpr bool value =
+        !is_span<U>::value && !is_std_array<U>::value &&
+        !std::is_array<U>::value && has_size_and_data<C>::value;
+};
+
+template <typename T>
+using remove_pointer_t = typename std::remove_pointer<T>::type;
+
+template <typename, typename, typename = void>
+struct is_container_element_type_compatible : std::false_type {};
+
+template <typename T, typename E>
+struct is_container_element_type_compatible<
+T, E,
+typename std::enable_if<
+    !std::is_same<typename std::remove_cv<decltype(
+            detail::data(std::declval<T>()))>::type,
+void>::value>::type>
+    : std::is_convertible<
+    remove_pointer_t<decltype(detail::data(std::declval<T>()))> (*)[],
+E (*)[]> {};
+
+template <typename, typename = size_t>
+struct is_complete : std::false_type {};
+
+template <typename T>
+struct is_complete<T, decltype(sizeof(T))> : std::true_type {};
+
+} // namespace detail
+
+template <typename ElementType, std::size_t Extent>
+class span {
+    static_assert(std::is_object<ElementType>::value,
+            "A span's ElementType must be an object type (not a "
+            "reference type or void)");
+    static_assert(detail::is_complete<ElementType>::value,
+            "A span's ElementType must be a complete type (not a forward "
+            "declaration)");
+    static_assert(!std::is_abstract<ElementType>::value,
+            "A span's ElementType cannot be an abstract class type");
+
+    using storage_type = detail::span_storage<ElementType, Extent>;
+
+public:
+    // constants and types
+    using element_type = ElementType;
+    using value_type = typename std::remove_cv<ElementType>::type;
+    using size_type = std::size_t;
+    using difference_type = std::ptrdiff_t;
+    using pointer = element_type*;
+    using const_pointer = const element_type*;
+    using reference = element_type&;
+    using const_reference = const element_type&;
+    using iterator = pointer;
+    using reverse_iterator = std::reverse_iterator<iterator>;
+
+    static constexpr size_type extent = Extent;
+
+    // [span.cons], span constructors, copy, assignment, and destructor
+    template <
+        std::size_t E = Extent,
+        typename std::enable_if<(E == dynamic_extent || E <= 0), int>::type = 0>
+            constexpr span() noexcept {}
+
+    TCB_SPAN_CONSTEXPR11 span(pointer ptr, size_type count)
+        : storage_(ptr, count) {
+        TCB_SPAN_EXPECT(extent == dynamic_extent || count == extent);
+    }
+
+    TCB_SPAN_CONSTEXPR11 span(pointer first_elem, pointer last_elem)
+        : storage_(first_elem, last_elem - first_elem) {
+        TCB_SPAN_EXPECT(extent == dynamic_extent ||
+                last_elem - first_elem ==
+                static_cast<std::ptrdiff_t>(extent));
+    }
+
+    template <std::size_t N, std::size_t E = Extent,
+             typename std::enable_if<
+                 (E == dynamic_extent || N == E) &&
+                 detail::is_container_element_type_compatible<
+                 element_type (&)[N], ElementType>::value,
+             int>::type = 0>
+     constexpr span(element_type (&arr)[N]) noexcept : storage_(arr, N) {}
+
+    template <std::size_t N, std::size_t E = Extent,
+             typename std::enable_if<
+                 (E == dynamic_extent || N == E) &&
+                 detail::is_container_element_type_compatible<
+                 std::array<value_type, N>&, ElementType>::value,
+             int>::type = 0>
+     TCB_SPAN_ARRAY_CONSTEXPR span(std::array<value_type, N>& arr) noexcept
+                 : storage_(arr.data(), N) {}
+
+    template <std::size_t N, std::size_t E = Extent,
+             typename std::enable_if<
+                 (E == dynamic_extent || N == E) &&
+                 detail::is_container_element_type_compatible<
+                 const std::array<value_type, N>&, ElementType>::value,
+             int>::type = 0>
+     TCB_SPAN_ARRAY_CONSTEXPR span(const std::array<value_type, N>& arr) noexcept
+                 : storage_(arr.data(), N) {}
+
+    template <typename Container, std::size_t E = Extent,
+                 typename std::enable_if<
+                     E == dynamic_extent && detail::is_container<Container>::value &&
+                     detail::is_container_element_type_compatible<
+                     Container&, ElementType>::value,
+                 int>::type = 0>
+     constexpr span(Container& cont)
+                     : storage_(detail::data(cont), detail::size(cont)) {}
+
+    template <typename Container, std::size_t E = Extent,
+                 typename std::enable_if<
+                     E == dynamic_extent && detail::is_container<Container>::value &&
+                     detail::is_container_element_type_compatible<
+                     const Container&, ElementType>::value,
+                 int>::type = 0>
+     constexpr span(const Container& cont)
+                     : storage_(detail::data(cont), detail::size(cont)) {}
+
+    constexpr span(const span& other) noexcept = default;
+
+    template <typename OtherElementType, std::size_t OtherExtent,
+             typename std::enable_if<
+                 (Extent == OtherExtent || Extent == dynamic_extent) &&
+                 std::is_convertible<OtherElementType (*)[],
+             ElementType (*)[]>::value,
+             int>::type = 0>
+    constexpr span(const span<OtherElementType, OtherExtent>& other) noexcept
+                 : storage_(other.data(), other.size()) {}
+
+    ~span() noexcept = default;
+
+    TCB_SPAN_CONSTEXPR_ASSIGN span&
+        operator=(const span& other) noexcept = default;
+
+    // [span.sub], span subviews
+    template <std::size_t Count>
+        TCB_SPAN_CONSTEXPR11 span<element_type, Count> first() const {
+            TCB_SPAN_EXPECT(Count <= size());
+            return {data(), Count};
+        }
+
+    template <std::size_t Count>
+        TCB_SPAN_CONSTEXPR11 span<element_type, Count> last() const {
+            TCB_SPAN_EXPECT(Count <= size());
+            return {data() + (size() - Count), Count};
+        }
+
+    template <std::size_t Offset, std::size_t Count = dynamic_extent>
+        using subspan_return_t =
+        span<ElementType, Count != dynamic_extent
+        ? Count
+        : (Extent != dynamic_extent ? Extent - Offset
+                : dynamic_extent)>;
+
+    template <std::size_t Offset, std::size_t Count = dynamic_extent>
+        TCB_SPAN_CONSTEXPR11 subspan_return_t<Offset, Count> subspan() const {
+            TCB_SPAN_EXPECT(Offset <= size() &&
+                    (Count == dynamic_extent || Offset + Count <= size()));
+            return {data() + Offset,
+                Count != dynamic_extent ? Count : size() - Offset};
+        }
+
+    TCB_SPAN_CONSTEXPR11 span<element_type, dynamic_extent>
+        first(size_type count) const {
+            TCB_SPAN_EXPECT(count <= size());
+            return {data(), count};
+        }
+
+    TCB_SPAN_CONSTEXPR11 span<element_type, dynamic_extent>
+        last(size_type count) const {
+            TCB_SPAN_EXPECT(count <= size());
+            return {data() + (size() - count), count};
+        }
+
+    TCB_SPAN_CONSTEXPR11 span<element_type, dynamic_extent>
+        subspan(size_type offset, size_type count = dynamic_extent) const {
+            TCB_SPAN_EXPECT(offset <= size() &&
+                    (count == dynamic_extent || offset + count <= size()));
+            return {data() + offset,
+                count == dynamic_extent ? size() - offset : count};
+        }
+
+    // [span.obs], span observers
+    constexpr size_type size() const noexcept { return storage_.size; }
+
+    constexpr size_type size_bytes() const noexcept {
+        return size() * sizeof(element_type);
+    }
+
+    TCB_SPAN_NODISCARD constexpr bool empty() const noexcept {
+        return size() == 0;
+    }
+
+    // [span.elem], span element access
+    TCB_SPAN_CONSTEXPR11 reference operator[](size_type idx) const {
+        TCB_SPAN_EXPECT(idx < size());
+        return *(data() + idx);
+    }
+
+    TCB_SPAN_CONSTEXPR11 reference front() const {
+        TCB_SPAN_EXPECT(!empty());
+        return *data();
+    }
+
+    TCB_SPAN_CONSTEXPR11 reference back() const {
+        TCB_SPAN_EXPECT(!empty());
+        return *(data() + (size() - 1));
+    }
+
+    constexpr pointer data() const noexcept { return storage_.ptr; }
+
+    // [span.iterators], span iterator support
+    constexpr iterator begin() const noexcept { return data(); }
+
+    constexpr iterator end() const noexcept { return data() + size(); }
+
+    TCB_SPAN_ARRAY_CONSTEXPR reverse_iterator rbegin() const noexcept {
+        return reverse_iterator(end());
+    }
+
+    TCB_SPAN_ARRAY_CONSTEXPR reverse_iterator rend() const noexcept {
+        return reverse_iterator(begin());
+    }
+
+private:
+    storage_type storage_{};
+};
+
+#ifdef TCB_SPAN_HAVE_DEDUCTION_GUIDES
+
+/* Deduction Guides */
+template <class T, size_t N>
+    span(T (&)[N])->span<T, N>;
+
+template <class T, size_t N>
+    span(std::array<T, N>&)->span<T, N>;
+
+template <class T, size_t N>
+    span(const std::array<T, N>&)->span<const T, N>;
+
+template <class Container>
+    span(Container&)->span<typename Container::value_type>;
+
+template <class Container>
+    span(const Container&)->span<const typename Container::value_type>;
+
+#endif // TCB_HAVE_DEDUCTION_GUIDES
+
+template <typename ElementType, std::size_t Extent>
+    constexpr span<ElementType, Extent>
+make_span(span<ElementType, Extent> s) noexcept {
+    return s;
+}
+
+template <typename T, std::size_t N>
+constexpr span<T, N> make_span(T (&arr)[N]) noexcept {
+    return {arr};
+}
+
+template <typename T, std::size_t N>
+TCB_SPAN_ARRAY_CONSTEXPR span<T, N> make_span(std::array<T, N>& arr) noexcept {
+    return {arr};
+}
+
+template <typename T, std::size_t N>
+    TCB_SPAN_ARRAY_CONSTEXPR span<const T, N>
+make_span(const std::array<T, N>& arr) noexcept {
+    return {arr};
+}
+
+template <typename Container>
+constexpr span<typename Container::value_type> make_span(Container& cont) {
+    return {cont};
+}
+
+template <typename Container>
+    constexpr span<const typename Container::value_type>
+make_span(const Container& cont) {
+    return {cont};
+}
+
+template <typename ElementType, std::size_t Extent>
+    span<const byte, ((Extent == dynamic_extent) ? dynamic_extent
+            : sizeof(ElementType) * Extent)>
+as_bytes(span<ElementType, Extent> s) noexcept {
+    return {reinterpret_cast<const byte*>(s.data()), s.size_bytes()};
+}
+
+template <class ElementType, size_t Extent,
+          typename std::enable_if<!std::is_const<ElementType>::value, int>::type = 0>
+              span<byte, ((Extent == dynamic_extent) ? dynamic_extent
+                      : sizeof(ElementType) * Extent)>
+as_writable_bytes(span<ElementType, Extent> s) noexcept {
+  return {reinterpret_cast<byte*>(s.data()), s.size_bytes()};
+}
+
+template <std::size_t N, typename E, std::size_t S>
+constexpr auto get(span<E, S> s) -> decltype(s[N]) {
+    return s[N];
+}
+
+} // namespace TCB_SPAN_NAMESPACE_NAME
+
+namespace std {
+
+template <typename ElementType, size_t Extent>
+class tuple_size<TCB_SPAN_NAMESPACE_NAME::span<ElementType, Extent>>
+: public integral_constant<size_t, Extent> {};
+
+template <typename ElementType>
+class tuple_size<TCB_SPAN_NAMESPACE_NAME::span<
+ElementType, TCB_SPAN_NAMESPACE_NAME::dynamic_extent>>; // not defined
+
+template <size_t I, typename ElementType, size_t Extent>
+class tuple_element<I, TCB_SPAN_NAMESPACE_NAME::span<ElementType, Extent>> {
+public:
+    static_assert(Extent != TCB_SPAN_NAMESPACE_NAME::dynamic_extent &&
+            I < Extent,
+            "");
+    using type = ElementType;
+};
+
+} // end namespace std
\ No newline at end of file
diff --git a/include/cppflow/tensor.h b/include/cppflow/tensor.h
index 62a0bbd..0bb48c4 100644
--- a/include/cppflow/tensor.h
+++ b/include/cppflow/tensor.h
@@ -14,6 +14,7 @@
 
 #include "context.h"
 #include "datatype.h"
+#include "span.h"
 
 namespace cppflow {
 
@@ -70,12 +71,12 @@ namespace cppflow {
         datatype dtype() const;
 
         /**
-         * Converts the tensor into a C++ vector
+         * Converts the tensor into a C++ span. There is no data copy on span for perfomance.
          * @tparam T The c++ type (must be equivalent to the tensor type)
-         * @return A vector representing the flat tensor
+         * @return A span representing the flat tensor
          */
         template<typename T>
-        std::vector<T> get_data() const;
+        cppflow::span<T> get_data() const;
 
 
         ~tensor() = default;
@@ -193,7 +194,7 @@ namespace cppflow {
     }
 
     template<typename T>
-    std::vector<T> tensor::get_data() const {
+    cppflow::span<T> tensor::get_data() const {
         auto res_tensor = TFE_TensorHandleResolve(this->tfe_handle.get(), context::get_status());
         status_check(context::get_status());
 
@@ -205,7 +206,7 @@ namespace cppflow {
 
         // Convert to correct type
         const auto T_data = static_cast<T*>(raw_data);
-        return std::vector<T>(T_data, T_data + size);
+        return cppflow::span<T>(T_data, size);
     }
 
     datatype tensor::dtype() const {