The Reef Short Sleeve Spring is made from Double-lined Nylon II Neoprene which is contour cut for a better fit. The YKK Zipper has a Velcro stop tab on the neck with a pull-take for easy entry and exit. The Spring suit has Flat-Locked seams for better comfort while in the water. The collar, sleeves, and leg cuffs are rolled with a zigzagged stitching finish.