This CoolGuard Bra is made from soft polyethylene. The breast protection insert extends around the underarm for added protection and to better locate the insert in position. Six sizes of insert are available. The complete CoolGuard offers protection against painful knocks. Also excellent when jogging where breast weight and motion can cause pain and shoulder strain. CoolGuard supports the breasts and hold them firmly in their natural position and shape. Most sports bras merely compress the breasts tight against the chest. Approved by AIBA for us in boxing. Inserts sold separately.