The perfect next-to-skin layer for summer riding, the short sleeve Assos SkinFoil Summer Body Insulator uses an innovative polypropylene fiber blend that is extremely light and able to absorb, transport and evaporate moisture quickly and efficiently. The anti-odor fiber is dermatologically approved and the seamless, tubular construction allows for a "push and pull" effect for a pleasing and non-restrictive comfortable fit. Ideal for 72 to 90 degrees Fahrenheit. White. S/M, L/XL or XLG/TIR(XXL-XXXL).