100% Polyester interlock.: Short sleeve T-shirt ideal for sportspeople looking for maximum comfort and breathability. Made of polyester and therefore very tough and elastic. In addition, this T-shirt stands out for delivering a very soft feel, being quick drying and wrinkle-free. The interlock fabric is very elastic, ideal for sportswear. Both sides, inside and out, are made of the same fabric. Ideal for practising sport at a professional level.