Odor Blocking: 4% Copper infused into fabric blocks nasty odors from developing. Temperature Control: Strategic ventilation areas let air flow in and out, keeping skin cooler. Anti-Chafing: Seamless construction prevents chafing. Stay-put Waistband: Flatter your silhouette with a smooth, grippy waistband that stays in place so you can focus on form. Ultimate Stretch: 4-way stretch technical fabric moves with you. Wash in cold water and/or with like colors to prevent color transfer. Fits true to size. Fabric: 60% Nylon, 36% Polyester, 4% Copper.