The Ergodyne Chill-Its 6700 Evaporative Cooling Tie Bandana offers a cooling sensation with a polymer-embedded cooling technology that works for up to four hours of relief from the heat. It has a low-profile construction from 100% cotton that is no-bulk wear under hard hats and has an adjustable tie closure for a comfortable fit for a wide range of head sizes. It looks great and works perfectly for fieldwork under the sun or outdoor recreation such as running, hiking, or other activities. Don't let heat-related sickness hamper your day at work by wearing this simple, effective, and comfortable bandana at the construction, trades, maintenance, landscaping, groundskeeping, assembly, freight, baggage, warehousing, distribution, and iron or steel fabrication. Activate this bandana by soaking it in water for 2 to 5 minutes to provide an instant cooling relief that lasts for up to four hours. This bandana will absorb water without bulk or residue. Run it again under water to reactivate and soften. This bandana or headband has a tie closure. Activate it by soaking into water for 2 to 5 minutes. It remains hydrated for up to 4 hours. This cooling bandana is re-usable by soaking it to reactivate.