Team Wendy's CAM FIT Retention System utilizes Cam Lock sliders for one-handed adjustment and secure fit. A Boa Fit System stabilizes the weight of the helmet by distributing a light, even pressure around the head, similar in feel to a baseball cap. The adjustment straps and chin-cup have been designed for a close, comfortable fit to the wearer's face. The asymmetric design keeps the buckle tucked smoothly along the jaw line while maintaining a snug, even feel around the chin-cup. The chin-cup lining ensures maximum comfort and chafe-free wear at any temperature. The CAM FIT Retention System is also available in a left eye dominant (LED) option on TeamWendy.com. All CAM FIT Retention Systems ship complete with ballistic hardware. Included hardware may not be compatible with side rail systems; in these cases original hardware can be used. SIZING: Measure the circumference of the head from the bottom of one side of the chin to the back of the crown of the head and down to the chin on the other side as shown in the head form image. M/L fits 26" - 29" circumference, XL fits 27.5" - 32.5".