Chill-Its® 6717 Hard Hat Pads & Shades• Soak in cold water 2-5 minutes to activate • Remains hydrated up to four hours • Conveniently attaches to standard hard hat suspension with hook and loop closures • Activated cooling polymers bring cooling power where you need it most to fight heat stress and fatigue • Protects neck from harmful UV rays• Reusable, just re-soak