STOP SWEAT! Fits any HAT, HELMET or HEADWEAR item. For Anyone Who Has a Head! A necessity under HATS, HELMETS or ANY HEADWEAR ITEM. A MUST for ANY ACTIVE PERSON! Patented product designed specifically to allow peak physical performance, by stopping sweat from blurring and burning one's eyes in any activity. Our unique combination of SPUNLACE ( Viscose and polyester blend) and SMS materials make a highly absorbent liner that whisks away perspiration. The "M" MELTBLOWN, in the SMS layer, has 1-3 microns per square inch, trapping oils and salts and allowing for moisture evaporation. It will work with any NIKE headwear; ex: Dri-Fit flex fit cap, Cadet cap, Jordan Headphone Bennie, team caps.