Ergodyne Chill-Its 6710CT PVA Evaporative Cooling Dew Rag is with a superior phase transition PVA material to soak up moisture and provide wink temperature change relief. Can be for hours or for prompt relief. recyclable, just to activate. for open-air activities, camping, yoga, baseball, softball, soccer, running, biking, days at the beach or on a boat, golf, landscaping, yard work, construction job sites, fishing, gardening, hiking.