MIPS SAFETY - The Mips system is designed to provide added safety for helmets in many accidents. For certain impacts, the system can reduce harmful rotational forces. DOUBLE ADJUSTMENT - 2 different thicknesses liners(0.23&0.31inch) and the adjustment dial maximize the head fit, flexibly adapted to different kinds of cycling glasses and avoid pulling hair. COMFORTABLE - The removeable visor and the skin-friendly adjustable chin strap offers comfortable wearing and better fit better A HELMET for MULTI-SPORT - Equipped with 25 individual vents for next-level ventilation for better experience when SKATING, CYCLING, BMX, MTB and more. WHAT YOU GET - 1 x OutdoorMaster MIPS bike helmet, 2 x liners, OutdoorMaster's friendly customer service. OutdoorMaster MIPS Adult Recreational Cycling Helmet

To get the most accurate measure, have a friend help with this.
- M: 55 - 58cm (21.6 - 23 inches)
- L: 57 - 61cm (22.5 - 24 inches)

Recommended Age Grading: Age 5 and older