Time trial and triathlon helmet.Wind tunnel tested.In-mold construction.High density EPS foam.Internal anchorage for adjustment straps.Comes with FaceShield visor (BHE-63, smoke) with hydrophobic coating. Water will drain out of your view while riding.Clear visor available separately.1 vent. Adjustable straps for a perfect and comfortable fit on the head with easy handling.FlexClose clamping system for easy height and circumference adjustment.Lining with optimal airflow made of washable QuickDry material.Sizes: M (52-58 cm).