The huge amount of sportswear made of functional materials makes it challenging for athletes to choose the correct item.... moreThe huge amount of sportswear made of functional materials makes it challenging for athletes to choose the correct item. Unique membrane fabrics are breathable, protective, compressible, and often "look too cool." The primary purpose of performance apparel is to improve the health and performance of athletes in all climates. Manufacturers continue to produce more or less radical and functional innovations in this area.