Warmth in an instant. Light weight for portability and convertibility on the bike. Contents are 84 Merino wool for moisture management and warmth, 11 nylon for durability, and 6 lycra for just the right amount of formfitting stretch 390 gm2 New Zealand Merino Flat lock seams Offset zipper relieves pressure and chafing on Achilles tendon Warmers are sized for men, go down one size for women's fit Machine Washable Material 84 Merino wool, 11 nylon, 6 lycral