The Rapha Core Jersey is a traditional cycling jersey. made of elastic polyester which provides coolness and comfort on moderate to hot days. Drop tail design provides extra secure fit and the under-grip keeps the jersey from moving. Raglan sleeves and elastic side panels are comfortable and allow you to move freely on the bike. A full-length zip allows us to personalize our ventilation and properly placed shoulder seams prevent fabric from pooling under the arms. Three back pockets give us space to take with you on the road. essentials and the super-soft collar and cuffs keep you comfortable on long rides. rides.