The Pro Sleeveless is perfect for racing and training. Delfino, a chlorine friendly fabric, has a dimpled mesh construction that provides extreme ventilation and helps to cool the athlete. The zipper is a 13 comfort zipper which means it is sewn so the teeth pull away from the user to reduce abrasion and chafing. An inner flap underneath protects the skin. 1538 cm comfort zip with inner flap: Zip is sewn so teeth pull away from the user to reduce abrasion and chafing. Inner flap protects skin from the zip. Front and back reflective accents: Enhance visibility. ProFit men. UPFSPF 50.