The EXO waterproof abrasive cap is an innovative solution that combines a composite cap with a cosmetic corundum coating. The EXO professional cap is made with the greatest care and from the best available materials. The inner element of the hood is a composite that ensures durability and comfort. It is covered with COSMETIC CORUNDUM not used in any other caps. In the EXO caps you will not observe "falling" of abrasive material !!!