The GORE Bike Wear Alp X Pro WS SO Zip Off is a jersey and a jacket in one. Made with windproofbreathable GORE Windstopper, the jersey protects you from warmth robbing wind while it allows your skin to breathe and regulate its temperature naturally. Furthering the Alp X's appeal are friction free ultrasonic seams to reduce chafing and skin irritation. An underflap runs the length of the zipper to prevent catching on undergarments or irritating skin. A partially elastic gripper on the hem keeps the jersey in place, even when the two rear pockets are weighed down and, an additional zippered pocket adds secure storage for keys or cards. Reflective piping on the sleeves and logos at the front and back keeps you visible during early evening and morning rides.The jersey features zip off raglan sleeves to allow your arms to cool off while you ride. GORE even included additional zip off short sleeves that you can substitute if you aren't into the sleeveless look.