RDX Exercise Training Sleeveless Vest Fitness Gym Stinger Tank Top Men Workout Muscle Tshirt Bodybuilding RDX body mapping technology vest with channels transport system & directional stretch Constructed from Coolmax fabrics are made from special polyester fibres Special channels transport systems that pull moisture away from the skin Directional stretch fabrics allows for better unrestricted movement Breathable fabric inhibits bacteria growth so your Vest doesnt smell