The Castelli Men's Core Seamless Cycling Base Layer keeps you warm and dry all year long. This base layer has reimagined fabric blend that repels moisture, so you won't feel like a wet sponge. The Core is designed with seamless construction to provide superior comfort. This jersey helps to wick away moisture so you stay dry even on the hottest days. The Castelli Men's Core Seamless Cycling Base Layer will provide the best quality in your rides.