diff --git a/bar.go b/bar.go
index d2ab14f..cf9413e 100644
--- a/bar.go
+++ b/bar.go
@@ -97,6 +97,22 @@
 	select {
 	case b.operateState <- func(s *bState) { result <- len(s.ewmaDecorators) != 0 }:
 		return newProxyReader(r, b, <-result)
+	case <-b.done:
+		return nil
+	}
+}
+
+// ProxyWriter wraps io.Writer with metrics required for progress tracking.
+// If bar is already completed or aborted, returns nil.
+// Panics if `w` is nil.
+func (b *Bar) ProxyWriter(w io.Writer) io.WriteCloser {
+	if w == nil {
+		panic("expected non nil io.Writer")
+	}
+	result := make(chan bool)
+	select {
+	case b.operateState <- func(s *bState) { result <- len(s.ewmaDecorators) != 0 }:
+		return newProxyWriter(w, b, <-result)
 	case <-b.done:
 		return nil
 	}
diff --git a/proxywriter.go b/proxywriter.go
new file mode 100644
index 0000000..96fe452
--- /dev/null
+++ b/proxywriter.go
@@ -0,0 +1,98 @@
+package mpb
+
+import (
+	"io"
+	"time"
+)
+
+type proxyWriter struct {
+	io.WriteCloser
+	bar *Bar
+}
+
+func (x proxyWriter) Write(p []byte) (int, error) {
+	n, err := x.WriteCloser.Write(p)
+	x.bar.IncrBy(n)
+	return n, err
+}
+
+type proxyReaderFrom struct {
+	proxyWriter
+}
+
+func (x proxyReaderFrom) ReadFrom(r io.Reader) (int64, error) {
+	n, err := x.WriteCloser.(io.ReaderFrom).ReadFrom(r)
+	x.bar.IncrInt64(n)
+	return n, err
+}
+
+type ewmaProxyWriter struct {
+	proxyWriter
+}
+
+func (x ewmaProxyWriter) Write(p []byte) (int, error) {
+	start := time.Now()
+	n, err := x.proxyWriter.Write(p)
+	if n > 0 {
+		x.bar.DecoratorEwmaUpdate(time.Since(start))
+	}
+	return n, err
+}
+
+type ewmaProxyReaderFrom struct {
+	ewmaProxyWriter
+}
+
+func (x ewmaProxyReaderFrom) ReadFrom(r io.Reader) (int64, error) {
+	start := time.Now()
+	n, err := x.WriteCloser.(io.ReaderFrom).ReadFrom(r)
+	if n > 0 {
+		x.bar.DecoratorEwmaUpdate(time.Since(start))
+	}
+	return n, err
+}
+
+func newProxyWriter(w io.Writer, b *Bar, hasEwma bool) io.WriteCloser {
+	pw := proxyWriter{toWriteCloser(w), b}
+	if hasEwma {
+		epw := ewmaProxyWriter{pw}
+		if _, ok := w.(io.ReaderFrom); ok {
+			return ewmaProxyReaderFrom{epw}
+		}
+		return epw
+	}
+	if _, ok := w.(io.ReaderFrom); ok {
+		return proxyReaderFrom{pw}
+	}
+	return pw
+}
+
+func toWriteCloser(w io.Writer) io.WriteCloser {
+	if wc, ok := w.(io.WriteCloser); ok {
+		return wc
+	}
+	return toNopWriteCloser(w)
+}
+
+func toNopWriteCloser(w io.Writer) io.WriteCloser {
+	if _, ok := w.(io.ReaderFrom); ok {
+		return nopWriteCloserReaderFrom{w}
+	}
+	return nopWriteCloser{w}
+}
+
+type nopWriteCloser struct {
+	io.Writer
+}
+
+func (nopWriteCloser) Close() error { return nil }
+
+type nopWriteCloserReaderFrom struct {
+	io.Writer
+}
+
+func (nopWriteCloserReaderFrom) Close() error { return nil }
+
+func (c nopWriteCloserReaderFrom) ReadFrom(r io.Reader) (int64, error) {
+	return c.Writer.(io.ReaderFrom).ReadFrom(r)
+}
diff --git a/proxywriter_test.go b/proxywriter_test.go
new file mode 100644
index 0000000..aafc6bc
--- /dev/null
+++ b/proxywriter_test.go
@@ -0,0 +1,120 @@
+package mpb_test
+
+import (
+	"bytes"
+	"io"
+	"strings"
+	"testing"
+
+	"github.com/vbauerster/mpb/v8"
+)
+
+type testWriter struct {
+	io.Writer
+	called bool
+}
+
+func (w *testWriter) Write(p []byte) (n int, err error) {
+	w.called = true
+	return w.Writer.Write(p)
+}
+
+func TestProxyWriter(t *testing.T) {
+	p := mpb.New(mpb.WithOutput(io.Discard))
+
+	var buf bytes.Buffer
+	tw := &testWriter{&buf, false}
+
+	bar := p.AddBar(int64(len(content)))
+
+	_, err := io.Copy(bar.ProxyWriter(tw), strings.NewReader(content))
+	if err != nil {
+		t.Errorf("io.Copy: %s\n", err.Error())
+	}
+
+	p.Wait()
+
+	if !tw.called {
+		t.Error("Read not called")
+	}
+
+	if got := buf.String(); got != content {
+		t.Errorf("Expected content: %s, got: %s\n", content, got)
+	}
+}
+
+type testWriteCloser struct {
+	io.Writer
+	called bool
+}
+
+func (w *testWriteCloser) Close() error {
+	w.called = true
+	return nil
+}
+
+func TestProxyWriteCloser(t *testing.T) {
+	p := mpb.New(mpb.WithOutput(io.Discard))
+
+	var buf bytes.Buffer
+	tw := &testWriteCloser{&buf, false}
+
+	bar := p.AddBar(int64(len(content)))
+
+	wc := bar.ProxyWriter(tw)
+	_, err := io.Copy(wc, strings.NewReader(content))
+	if err != nil {
+		t.Errorf("io.Copy: %s\n", err.Error())
+	}
+	_ = wc.Close()
+
+	p.Wait()
+
+	if !tw.called {
+		t.Error("Close not called")
+	}
+}
+
+type testWriterReadFrom struct {
+	io.Writer
+	called bool
+}
+
+func (w *testWriterReadFrom) ReadFrom(r io.Reader) (n int64, err error) {
+	w.called = true
+	return w.Writer.(io.ReaderFrom).ReadFrom(r)
+}
+
+type dumbReader struct {
+	r *strings.Reader
+}
+
+func (r dumbReader) Read(p []byte) (int, error) {
+	return r.r.Read(p)
+}
+
+func TestProxyWriterReadFrom(t *testing.T) {
+	p := mpb.New(mpb.WithOutput(io.Discard))
+
+	var buf bytes.Buffer
+	tw := &testWriterReadFrom{&buf, false}
+
+	bar := p.New(int64(len(content)), mpb.NopStyle())
+
+	// To trigger ReadFrom, WriteTo needs to be hidden, hence a dumb wrapper
+	dr := dumbReader{strings.NewReader(content)}
+	_, err := io.Copy(bar.ProxyWriter(tw), dr)
+	if err != nil {
+		t.Errorf("io.Copy: %s\n", err.Error())
+	}
+
+	p.Wait()
+
+	if !tw.called {
+		t.Error("ReadFrom not called")
+	}
+
+	if got := buf.String(); got != content {
+		t.Errorf("Expected content: %s, got: %s\n", content, got)
+	}
+}