The Chill-Its 6670CT Cooling Hard Hat Neck Shade straps into hard hats to deliver four hours of cooling relief while also shading the neck from sun damage. The lightweight shade features advanced PVA (polyvinyl alcohol) cooling technology for instant cooling without bulk or slime, with a wide panel that extends down for complete back-of-neck-coverage. This hard hat neck shade fits most hard hats and safety helmets, easily and securely attaching to the suspension with two hook and loop straps. Heat-related illness continuously ranks among the top causes of worksite accidents and fatalities. Evaporative cooling technologies such as PVA are a simple, effective and comfortable solution for heat stress prevention. Similar to how sweat cools the body, evaporative technologies use an external water source to draw heat away-helping to regulate body temperature while providing cool relief.