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Advanced PVA material activates easily and quickly when run under water for one minute. Re-usable: just soak in water to re-activate. Super-evaporative cooling process helps keep you cool. Lightweight and low profile; perfect for under hard hats. Tie closure. Patented design. Applications: construction, trades, maintenance, landscaping/grounds, assembly/fabrication, material handling, freight/baggage, warehousing/distribution, iron/steel fabrication.