Shimano Breath Hyper Baselayer The Shimano Breath Hyper Baselayer keeps you dry & warm in almost all weather conditions. By warming you at the core, Breath Hyper promotes blood flow out to your hands & feet that are usually vulnerable to the cold. It also draws moisture away from your skin to reduce the chilling effects of sweat Features Material body: 60% acryl, 12% rayon, 12% polyester, 10% polyamide, 6% unspecified fibre (acrylate fibre) Material parts: 100% polyester Breath Hyper technology All round usage & versatility Basis of the Shimano layer system Buy Shimano Clothing from Chain Reaction Cycles, the World's Largest Online Bike Store.