Shock Doctor Velocity ShockSkin Baseball Sleeveless Shirt microfiber Movable fabrics and vented foam pads move and contour with the body for ultimate comfort and lightweight protection Four-way stretch mesh zones and vented foam maximize breathability in multiple areas to accelerate the transfer of heat and moisture away from your body Men's size XS fits a 29" to 31" chest Chafe-free flatock seams and a droptail hem for maximum comfort