Breath hyper long sleeve baselayer the shimano breath hyper thermoshirt is a long sleeve base layer that keeps you dry and warm in almost all weather conditions by warming you at the core breath hyper promotes blood flow out to your hands and feet areas that are usually vulnerable to the cold it also draws moisture away from your skin to reduce the chilling effects of sweat with breath hyper garments you can stay warm and comfortable on those long winter rides material body 60 acryl 12