TESLA Mens Boys Long Sleeve Top Lightweight Compression Base Layer Sports Skins 84% Polyester 16% Polyurethane Tight fitting like a second skin. Please use the size guide to select your size - scroll down to product description. If you prefer a looser fit, go up a size. Inexpensive, high quality performance base layer, ideal for all sporting events and exercise activities. Can be worn on its own or as an under layer/layering for indoor and outdoor fitness and training. Please see product description for full product benefits Any questions please just ask, full range of shorts, pants, tops and sets available