KLEIN COOLING BANDANA ® 60123 KLEIN® COOLING TOWELS & COOLING BANDANA Klein Cooling Towels and Klein Cooling Bandana help you cool down during and after hard work or strenuous activities. The PVA material has extraordinary absorbent properties that allow it to retain moisture and stay cooler than ambient air around it. Simply wet the towel or bandana and wring out the excess water to activate; stays cool for hours.