Designed specifically for open water training and races. The jammers lifts your hips up like a wetsuit and helps you find the right water position. You will achieve same effect as using a pull buoy, but it allows you to kick and turn naturally. The Buoyancy Flex Jammers has a front 5 mm base of extremely flexible GLIDESKIN very useful in the swimming session while the back 3 mm bilined neoprene has been conceived to improve abrasive endurance and to reduce the risk of scratch. Multifunctional pocket system can be used to customize your jammer and add more buoyancy to achieve your perfect water position. More elasticity. Drawstrings at the waist. Unisex model.