The Zephyr Cap features laser matrix ventilation, hook and loop sizing strap, a moisture wicking
sweatband and mesh interior with crown pocket.
Zephyr Sizes: S/M(21.8-23.5"), L/XL(22.8-24.5").
NOTE: 98% of adults fit easily in the 2 sizes. To measure your head, circle the crown of your head with a string or dental floss (above eyebrows and ears). Use a ruler to measure the string and compare to the above chart. Upon receiving your hat, loosen or tighten the rear sizing system (if applicable) for a custom fit. Fit the hat slightly above eyebrows and ears to allow front and peripheral vision. Crown fabric should remain loose.