diff --git a/futures-io/Cargo.toml b/futures-io/Cargo.toml
index ba8cd4aa7d..d0b4603cdf 100644
--- a/futures-io/Cargo.toml
+++ b/futures-io/Cargo.toml
@@ -15,12 +15,11 @@ The `AsyncRead` and `AsyncWrite` traits for the futures-rs library.
 name = "futures_io"
 
 [features]
-std = ["futures-core-preview/std", "iovec"]
+std = ["futures-core-preview/std"]
 default = ["std"]
 
 [dependencies]
 futures-core-preview = { path = "../futures-core", version = "=0.3.0-alpha.14", default-features = false }
-iovec = { version = "0.1", optional = true }
 
 [dev-dependencies]
 futures-preview = { path = "../futures", version = "=0.3.0-alpha.14" }
diff --git a/futures-io/src/lib.rs b/futures-io/src/lib.rs
index d9e04c88ca..2992602a7b 100644
--- a/futures-io/src/lib.rs
+++ b/futures-io/src/lib.rs
@@ -20,14 +20,12 @@ mod if_std {
     use std::pin::Pin;
     use std::ptr;
 
-    // Re-export IoVec for convenience
-    pub use iovec::IoVec;
-
-    // Re-export io::Error so that users don't have to deal
+    // Re-export some `std::io` items so that users don't have to deal
     // with conflicts when `use`ing `futures::io` and `std::io`.
     pub use self::StdIo::Error as Error;
     pub use self::StdIo::ErrorKind as ErrorKind;
     pub use self::StdIo::Result as Result;
+    pub use self::StdIo::{IoVec as IoVec, IoVecMut as IoVecMut};
 
     /// A type used to conditionally initialize buffers passed to `AsyncRead`
     /// methods, modeled after `std`.
@@ -133,7 +131,7 @@ mod if_std {
         /// `Interrupted`.  Implementations must convert `WouldBlock` into
         /// `Poll::Pending` and either internally retry or convert
         /// `Interrupted` into another error kind.
-        fn poll_vectored_read(self: Pin<&mut Self>, cx: &mut Context<'_>, vec: &mut [&mut IoVec])
+        fn poll_read_vectored(self: Pin<&mut Self>, cx: &mut Context<'_>, vec: &mut [IoVecMut<'_>])
             -> Poll<Result<usize>>
         {
             if let Some(ref mut first_iovec) = vec.get_mut(0) {
@@ -194,7 +192,7 @@ mod if_std {
         /// `Interrupted`.  Implementations must convert `WouldBlock` into
         /// `Poll::Pending` and either internally retry or convert
         /// `Interrupted` into another error kind.
-        fn poll_vectored_write(self: Pin<&mut Self>, cx: &mut Context<'_>, vec: &[&IoVec])
+        fn poll_write_vectored(self: Pin<&mut Self>, cx: &mut Context<'_>, vec: &[IoVec<'_>])
             -> Poll<Result<usize>>
         {
             if let Some(ref first_iovec) = vec.get(0) {
@@ -253,10 +251,10 @@ mod if_std {
                 Pin::new(&mut **self).poll_read(cx, buf)
             }
 
-            fn poll_vectored_read(mut self: Pin<&mut Self>, cx: &mut Context<'_>, vec: &mut [&mut IoVec])
+            fn poll_read_vectored(mut self: Pin<&mut Self>, cx: &mut Context<'_>, vec: &mut [IoVecMut<'_>])
                 -> Poll<Result<usize>>
             {
-                Pin::new(&mut **self).poll_vectored_read(cx, vec)
+                Pin::new(&mut **self).poll_read_vectored(cx, vec)
             }
         }
     }
@@ -284,7 +282,7 @@ mod if_std {
             Pin::get_mut(self).as_mut().poll_read(cx, buf)
         }
 
-        fn poll_vectored_read(self: Pin<&mut Self>, cx: &mut Context<'_>, vec: &mut [&mut IoVec])
+        fn poll_vectored_read(self: Pin<&mut Self>, cx: &mut Context<'_>, vec: &mut [IoVecMut<'_>])
             -> Poll<Result<usize>>
         {
             Pin::get_mut(self).as_mut().poll_vectored_read(cx, vec)
@@ -304,6 +302,12 @@ mod if_std {
             {
                 Poll::Ready(StdIo::Read::read(&mut *self, buf))
             }
+
+            fn poll_read_vectored(mut self: Pin<&mut Self>, _: &mut Context<'_>, vec: &mut [IoVecMut<'_>])
+                -> Poll<Result<usize>>
+            {
+                Poll::Ready(StdIo::Read::read_vectored(&mut *self, vec))
+            }
         }
     }
 
@@ -327,10 +331,10 @@ mod if_std {
                 Pin::new(&mut **self).poll_write(cx, buf)
             }
 
-            fn poll_vectored_write(mut self: Pin<&mut Self>, cx: &mut Context<'_>, vec: &[&IoVec])
+            fn poll_write_vectored(mut self: Pin<&mut Self>, cx: &mut Context<'_>, vec: &[IoVec<'_>])
                 -> Poll<Result<usize>>
             {
-                Pin::new(&mut **self).poll_vectored_write(cx, vec)
+                Pin::new(&mut **self).poll_write_vectored(cx, vec)
             }
 
             fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<()>> {
@@ -362,7 +366,7 @@ mod if_std {
             Pin::get_mut(self).as_mut().poll_write(cx, buf)
         }
 
-        fn poll_vectored_write(self: Pin<&mut Self>, cx: &mut Context<'_>, vec: &[&IoVec])
+        fn poll_vectored_write(self: Pin<&mut Self>, cx: &mut Context<'_>, vec: &[IoVec<'_>])
             -> Poll<Result<usize>>
         {
             Pin::get_mut(self).as_mut().poll_vectored_write(cx, vec)
@@ -385,6 +389,12 @@ mod if_std {
                 Poll::Ready(StdIo::Write::write(&mut *self, buf))
             }
 
+            fn poll_write_vectored(mut self: Pin<&mut Self>, _: &mut Context<'_>, vec: &[IoVec<'_>])
+                -> Poll<Result<usize>>
+            {
+                Poll::Ready(StdIo::Write::write_vectored(&mut *self, vec))
+            }
+
             fn poll_flush(mut self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Result<()>> {
                 Poll::Ready(StdIo::Write::flush(&mut *self))
             }
@@ -413,6 +423,12 @@ mod if_std {
             Poll::Ready(result)
         }
 
+        fn poll_write_vectored(self: Pin<&mut Self>, _: &mut Context<'_>, vec: &[IoVec<'_>])
+            -> Poll<Result<usize>>
+        {
+            Poll::Ready(StdIo::Write::write_vectored(&mut self.get_mut().get_mut().as_mut(), vec))
+        }
+
         fn poll_flush(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Result<()>> {
             Poll::Ready(StdIo::Write::flush(&mut self.get_mut().get_mut().as_mut()))
         }
diff --git a/futures-util/src/io/mod.rs b/futures-util/src/io/mod.rs
index e2c2473472..7c56768f68 100644
--- a/futures-util/src/io/mod.rs
+++ b/futures-util/src/io/mod.rs
@@ -7,7 +7,7 @@
 
 use std::vec::Vec;
 
-pub use futures_io::{AsyncRead, AsyncWrite, IoVec};
+pub use futures_io::{AsyncRead, AsyncWrite, IoVec, IoVecMut};
 
 #[cfg(feature = "io-compat")] use crate::compat::Compat;
 
diff --git a/futures-util/src/io/split.rs b/futures-util/src/io/split.rs
index 333fc17983..3fae5c509b 100644
--- a/futures-util/src/io/split.rs
+++ b/futures-util/src/io/split.rs
@@ -1,6 +1,6 @@
 use crate::lock::BiLock;
 use futures_core::task::{Context, Poll};
-use futures_io::{AsyncRead, AsyncWrite, IoVec};
+use futures_io::{AsyncRead, AsyncWrite, IoVec, IoVecMut};
 use std::io;
 use std::pin::Pin;
 
@@ -43,10 +43,10 @@ impl<R: AsyncRead> AsyncRead for ReadHalf<R> {
         lock_and_then(&self.handle, cx, |l, cx| l.poll_read(cx, buf))
     }
 
-    fn poll_vectored_read(self: Pin<&mut Self>, cx: &mut Context<'_>, vec: &mut [&mut IoVec])
+    fn poll_read_vectored(self: Pin<&mut Self>, cx: &mut Context<'_>, vec: &mut [IoVecMut<'_>])
         -> Poll<io::Result<usize>>
     {
-        lock_and_then(&self.handle, cx, |l, cx| l.poll_vectored_read(cx, vec))
+        lock_and_then(&self.handle, cx, |l, cx| l.poll_read_vectored(cx, vec))
     }
 }
 
@@ -57,10 +57,10 @@ impl<W: AsyncWrite> AsyncWrite for WriteHalf<W> {
         lock_and_then(&self.handle, cx, |l, cx| l.poll_write(cx, buf))
     }
 
-    fn poll_vectored_write(self: Pin<&mut Self>, cx: &mut Context<'_>, vec: &[&IoVec])
+    fn poll_write_vectored(self: Pin<&mut Self>, cx: &mut Context<'_>, vec: &[IoVec<'_>])
         -> Poll<io::Result<usize>>
     {
-        lock_and_then(&self.handle, cx, |l, cx| l.poll_vectored_write(cx, vec))
+        lock_and_then(&self.handle, cx, |l, cx| l.poll_write_vectored(cx, vec))
     }
 
     fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
diff --git a/futures/src/lib.rs b/futures/src/lib.rs
index f20f7a86a3..a83e9bd56e 100644
--- a/futures/src/lib.rs
+++ b/futures/src/lib.rs
@@ -268,8 +268,9 @@ pub mod io {
     //! sinks.
 
     pub use futures_io::{
-        Error, Initializer, IoVec, ErrorKind, AsyncRead, AsyncWrite, Result
+        Error, Initializer, IoVec, IoVecMut, ErrorKind, AsyncRead, AsyncWrite, Result,
     };
+
     pub use futures_util::io::{
         AsyncReadExt, AsyncWriteExt, AllowStdIo, Close, CopyInto, Flush,
         Read, ReadExact, ReadHalf, ReadToEnd, Window, WriteAll, WriteHalf,