Features upper body mesh CONDITIONING WEBTM for extra support, Coolmaxreg; & Lycra stretch fabric for moisture-wicking with mesh Coolmaxreg; back panels for comfort & breathability, back pockets, & flat seam construction. The CONDITIONING WEBTM ats as an exoskeleton supporting the upper body. It supports the major muscles of the chest & upper back. It promotes better posture, improving efficiency & power. It enhances arm movement & mobility. It helps reduce excess muscle vibration. It reduces muscle fatigue. It will even help you take out the garbage and balance your checkbook. Sizes: S, M, L, XL.