As winter bites bite back with the rd zero jacketevolved from their innovative rd jacket sportful use a unique combination of fabrics and strategically placed breathable polartec174 alpha174 insulation for the best in cold weather performance the layers and fabrics work together to move moisture away from the skin while keeping the body comfortably warm and dry this jacket with its tailored fit is surprisingly warm but also comfortable for fast riding as the name implies this is jus