The women's specific K2 Virtue Helmet offers the top-end features you crave and the protection you need. With an MIPS liner for added safety and equipped with the 360 K2Dialed fit system and Dual Active Matrix venting, the Virtue Helmet will keep you cool – both literally and figuratively.MIPS Protection – MIPS is a protection system integrated into select K2 helmet models that can offer increased protection in falls. Hybrid Construction – This unique construction features the best of both In-Mold and Hard-Shell constructions. The primary In-Mold construction makes the helmet incredibly light, while the secondary Hard-Shell upper allows for increased durability.Tech Foam Liner – Compression-formed, precise-fit liner with removable ear pad and neck roll for a convertible customized fit.360° K2Dialed Fit System – The 360° K2Dialed Fit System is an evolution of the K2Dialed Fit System, delivering unparalleled comfort around your entire head. An intricate web design results in 360° of even pressure distribution for a secure and snug fit that you customize with the twist of a dial.Dual Active Matrix Venting – User-regulated Active Matrix venting combined with integrated Passive Channel venting.Bike Certified – Certified by North American bicycle helmet safety standard and European bicycle and skateboard helmet safety standard.Sizes (head circumference) – S(20-1/2" - 21-5/8"), M(22" - 23-1/8").