Best seller. Breast, ribs and sternum are all protected by the flexible, virtually unbreakable, polyethylene guard, which is held firmly in place by a special cover with two state-of-the-art front panels, made from hi-tech two-way stretch Polycotton/ Lycra. The panels in the fabric allow movement of moisture to speed evaporation - the body's natural cooling method. The Maxi Guard cover has plenty of stretch, so the cover is fitted first, than the guard is inserted between the front layers of the fabric and removed after competition to further aid cooling.