The Connelly Reverb Neo Vest utilizes a 4-way stretch neoprene and thin, super-soft foam to keep the vest snug to every contour of your body. The Reverb Vest incorporates an "X" shaped segmented back panel to give the rider 360 of mobility when tweaking grabs or getting inverted.• Not a U.S. Coast Guard Approved Life Jacket• Thin profile, 4-way stretch neoprene• Front zip with no straps or buckles to get in the way• "X" shaped rear panels for increased mobility• Contoured arm holes• Men's Chest Sizes: S(32"-36"), M(36"-40"), L(40"-44"), XL(44"-48") | Connelly Reverb Neo Vest Medium | The House