Armskins are designed to provide warmth & protection for the arms in temperatures ranging from 30F to 50F(-1C to 10C) Easy on, easy off, stretch fit Covers from wrist to top of biceps Excellent for cycling, running, and hiking Keeps you warm in cold, wet conditions Machine wash cool, tumble dry low. No bleach softeners, or harsh detergents 66% Merino Wool, 31% Nylon, 3% Lycra Sold as a pair SM/MD: Measuring from wrist to top of bicep: 15 - 18 inches, Less than 5'9 and 160 lbs LG/XL: Measuring from wrist to top of bicep: 18.5 - 21.5 inches, Greater than 5'9 and 160 lbs