Info Washing Instructions Sweat-n-StretchWe use high quality 80% Nylon/ 20% Spandex fabric that clings to the body, absorbing excess moisture.Lightweight, Quick-dry & Comfortable.First time washing, soak in cold water with 1/2 cup white vinegar to set color and prevent bleeding. Machine wash on delicate cycleNo fabric softenerHang to dry is bestAvoid Dryer if you want your colors to stay bright and clothes to last a very long time!Machine wash, inside out, cold water, gentle cycle. Wash similar colors together.Do not bleach. Mens Sizing X-Small = 25-27″Small = 28-30″Medium = 31-34″Large = 36″X-Large = 38″ Womens Sizing X-Small = 4-6Small = 6-8Medium = 10-12Large = 12-14X-Large = 16