Stay Cool on the job all day long with a cooling hard hat pad from Pyramex Safety. Evaporative cooling material technology provides hours of unmatched heat stress relief. The pad fits on the Suspension of nearly any hard hat with loop and hook closures and is easy to activate, simply soak in Cool water for 2-5 minutes and enjoy instant cooling relief. The pad is reusable, meaning its easy to get years and years of use for such an economical price. One size fits all.