Ergodyne Chill-Its 6710 Evaporative Cooling Bandana Triangle Hat Polymers Tie Closure (12335E-XX)
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Evaporative Cooling Triangle Hat: Activated polymers bring cooling power where you need it most.

Features:

Activate by soaking in water for 2-5 minutes

Re-usable: just soak in water to re-activate

Tie closure