Cooling triangle hat with towel. Evaporative cooling process keeps you cool all day, reduces the effects of heat stress, and fights fatigue. Advanced PVA material activates easily and quickly when soaked in water for 2 to 5 minutes. Remains hydrated, providing cool comfort for hours. Reusable, just re-soak. Lightweight and low profile, perfect for under hard hats and helmets. Tie closure for personal fit. 1 size fits all.