Giro: CAPABLY EQUIPPED FOR FUN AND ADVENTURE The Source MIPS helmet combines advanced performance and protection in a rugged, trail-ready design.Featuring deep coverage with aggressive ventilation from 17 vents coupled with deep internal channeling, it helps keep things cool even when the riding gets rowdy.Also with the comfort and secure feel of the Roc Loc® 5 fit system with integrated MIPS® brain protection, plus a moto-style adjustable screw-in visor and full lower hardbody durability, you get a helmet that’s capably equipped for fun and adventure. SPECS- Integrated Mips® brain protection system- Adjustable moto-style screw-in visor- Coolfit™ paddingCONSTRUCTION- Full-wrap In-Mold polycarbonate shell with EPS linerFIT SYSTEM- Roc Loc® 5 MipsVENTILATION- 17 Vents and deep internal channelingSUPER FIT™ SIZES- S 20”–21.75” / 51–55cm- M 21.75”–23.25” / 55–59cm- L 23.25”–24.75” / 59–63cm- XL 24”–25.55” / 61–65cmCERTIFICATION- Complies with the US CPSC Safety Standard for Bicycle Helmet for Persons Age 5 and Older