Picked this up tonight. It's 100% Polyester, wind/water resistant. Packs into a back pocket. When stuffed, it measures around 5x7x1.5", though it can be compressed to probably 1.5 fists. Super high quality? No. But it's $20. Check out your local store! Weighed mine at 6.6oz
Men's
http://www.sportsauthority.com/ASICS-Mens-Packable-Jacket/product.jsp?productId=28711956
Women's
http://www.sportsauthority.com/ASICS-Womens-Packable-Jacket/product.jsp?productId=28893456

