MPM Medical CoolMagic™ Hydrogel Polymer Sheet Dressing 8" x 12", Semi-occlusive, Sterile, Instant Cooling, Soothing, Hydrophilic, Low-density Film BackPrevents bacteria and foreign matter from entering wound. Hydrophilic and absorptive, it will absorb three times its weight. Cools live nerve endings due to 90% water-10% polyethylene formulation. Semi-occlusive, allowing for flow of oxygen. Prevents bacteria and foreign matter from entering wound. Hydrophilic and absorptive it will absorb three times its weight. Cools live nerve endings due to 90% water-10% polyethylene formulation. Will not damage tissue when removed. It provides a cooling effect, is hydrophilic and will absorb at least three times its weight in blood, serum or water. Backed with an inert, low-density film that controls water vapor transmission during storage and makes the gel easy to handle.