Complies with one or more of the following safety standards for bicycle helmets: CPSC, SNELL B90A, CE and AS/NZS. One-size system is based on women's head sizing and designed for easy and accurate fit. Headset SX fit system with micro-adjustable dial for easy, secure and accurate fit. Reflective webbing for extra safety. Elegant shape with extended coverage and excellent ventilation. 4th Dimension Cooling System to optimize ventilation. In-molded shell improves strength and reduces weight. Light and easy to use U-Turn strap adjusters. Patented clip-on visor included. Universal size 50-58cm.