Ergodyne Chill-Its 6670CT Hi-Viz Lime Evaporative Hard Hat Neck Shade features PVA material that is activated easily when run under water for 1 min and provides cooling sensation. It comes with patent design and hook-loop strap for easy attachment. It is re-usable when re-wet and finds application for construction, trades, maintenance, landscaping/grounds, assembly/fabrication, material handling, freight/baggage, warehousing/distribution, iron/steel fabrication.