New York Yarns' Olympic is a machine washable yarn that you wouldn't even know is mostly acrylic.

This worsted weight yarn will give your knitting and crochet a soft drape. The solid color scheme comes in some boldly fashionable colors (my favorite is Jade), which will give you stunning stitch definition, perfect for cable knitting and warm knitted sweaters. 

Worsted Weight Yarn
70% Acrylic, 30% Wool
130 Yards (119 meters)
Ball Weight: 1.76 oz (50 grams)
Gauge: 4 inches = 18 stitches on 
Machine wash on gentle cycle, Lay flat to dry

We recommend these awesome knitting patterns with Olympic yarn: