ONYX COOL Cap (58°)


The 58° ONYX COOL Cap is made with a specially formulated plant-based cooling phase material (PCM) that safely and comfortably fits inside a construction hard hat or baseball cap to cool your head and protect against heat stress.  Provides soothing relief for headaches and migraines.  May also be used to stimulate hair growth.


  • This cool (not too cold) cap is safe to wear directly on the skin without risk of ice burn or frostbite
  • Maintains constant 58° cooling for 30-45 minutes, depending on use
  • Reusable: re-cools in the refrigerator in 30 minutes or in a cooler of ice
  • Latex-free
  • Made in America. FDA registered. HSA and FSA reimbursable.
  • Dimensions: 10 x 11 x 0.25 inches.   6 oz.

Care and Use:

  • Refrigerate for 30 minutes.
  • Wear cool white padding directly on head until cool pads become clear.
  • To clean, use a damp cloth and mild soap. Air dry.
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Additional information

Weight 6 oz
Dimensions 10 × 11 × .25 in
Product Dimensions

10 in x 11 in x .25 in


6 oz


Veltex fabric (khaki); Aromatic Polyether Polyurethane; Elastic straps with hook and loop closure; PCM Octadecane molecular formula C18H38 or CH3(CH2)16CH3.


Petal shaped cap cooler


FDA Class 1 Medical Device


Made in the USA


Cool Blue