A few words about custom earplugs and helmet use. These earplugs are a full helix design, which basically means they fill the outer ear and extend into the ear canal past the second bend, a deep mold. Helmet manufacturers make a helmet quieter by adding foam padding to isolate your ear from wind noise. If this padding causes your ear to deflect it can "rock" the earplug and cause a pressure point where the plug extends into the ear canal. This is easily remedied by pulling down the helmet liner and removing some of the foam rubber padding from around the ear area.

CAUTION: DO NOT REMOVE OR OTHERWISE MODIFY THE STYROFOAM SHOCK ABSORBTION MATERIAL INSIDE YOUR HELMET.