The stylish Bontrager Solstice MIPS Moutain Bike Cycling Helmet features the MIPS brain protection system, Fidlock magnetic fastener and headmaster fit system.Key FeaturesFidlock magnetic buckle fastens effortlessly for a quick, secure fit.The intuitive, one-handed headmaster fit system adjusts height and circumference.Built-in and removable visor options give you two choices for constant coverage.Lockdown dividers make helmet strap management clean and easy to adjust.Internal, recessed channels move airflow over your head to keep you cool and dry.Soft, comfortable, moisture-wicking and washable helmet pads for added comfort.SizingSmall / Medium 51cm - 58cmMedium / Large 55 cm- 61cm