Great for all indoors and sports outdoors, such like: working in chilly fall weather, cycling, hiking, backpacking,running, yoga, training, morning jogging, as undershirts or daily casual wear. Tight Fitting,like a second skin. Flat lock seams to prevent chafing,Lightweight provides comfortable feeling against skin. Moisture Transport System wicks sweat to keep you dry and light. Super-soft fabric delivers incredible all-day comfort, Stretch fabric for natural range of motion. Pull On closure. 85% Polyester, 15% Spandex.