The Ergodyne Chill-Its 6717CT Evaporative Cooling Hard Hat Neck Shade with Cooling Towel straps into hard hats to deliver up to 4 hours of cooling relief while also shading the neck from sun damage. The low-profile and lightweight hard hat cooling pad features advanced PVA cooling technology for instant cooling without bulk or slime, making it comfortable to wear under hard hats. The wide panel shade extends down for complete back-of-neck-coverage. This hard hat neck shade fits most hard hats and safety helmets, easily 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. When activated, this PVA hard hat neck shade is comfortable and refreshing for even the hottest days of the year. Simply activate it by running under water for 1 minute for instant cooling relief that lasts for up to 4 hours. The PVA will retain water without bulk or residue. Machine wash as needed and hang to dry. Note that PVA materials stiffen as they dry. Simply run under water to reactivate and soften. Ideal for construction, telecommunications or anyone wearing head protection while working in the heat.