• (1) Hard Hat Liner
• Effective Releife from Heat Stress
• Provides 5-10 hours of Active Cooling Per Soak
• Hook and Loop for attachment to Hard Hat or Bump Cap harness
• No Bulging Gels or Harmful Chemical Crystals
HyperKewl Evaporative Cooling Hard Har Liners are a must have item for protective Hard Hats. The HyperKewl inner layer actively cools for 5-10 hours per soak to effectivly Avoid Heat Stress. Cool Mesh outter layer allows for optimum airflow in both Hard Hats and Bump Caps.