RDX offers quality that won't tap and suits every generation of body builders. The fitness vest in contrived of 100% polyester material, the greatest advantage of polyester is its breathability. In hot weather, it keeps your body cool. It has strong fibers which do not wear down as quickly, while being flexible and are unaffected to wrinkles and shrinking. The breathable holes in the back prevent scorching and irritation to the skin. It has great holding capacity for water. It allows to easily wick away perspiration during bodybuilding, weightlifting, aerobics and sporting activities.