Giro Source MIPS Helmet Advanced trail performance. Ready for anything. The Giro Source MIPS combines serious performance and protection in a rugged, trail-ready design that can handle whatever the trail throws at it. Deep coverage and 17 Wind Tunnel vents with internal channeling keep air moving efficiently even at low speeds, so you stay cool on technical climbs and hot days alike. Integrated Mips(R) brain protection is built directly into the Roc Loc(R) 5 fit system for a close, comfortable fit with no added bulk, and a full lower Hardbody(TM) wrap adds durability exactly where trail helmets take the most abuse. A moto-style screw-in visor adjusts to four indexed positions - three riding positions plus a high position for goggle storage - so dialling in your setup on the fly is effortless. Features Integrated Mips(R) Brain Protection System - the Mips slip plane is integrated directly into the Roc Loc(R) 5 fit system to reduce rotational forces in certain impacts without adding bulk or compromising fit and comfort17 Wind Tunnel vents with deep internal channeling - active vents in the shell work with internal exhaust channels to push cool air over and around the rider's head while forcing heat and stale air out Roc Loc(R) 5 Fit System - one-handed micro-adjustment of fit tension and fore-aft tilt in seconds, with a secure, skull-hugging feel throughout the ride Adjustable moto-style screw-in visor - adjusts through three indexed riding positions plus a high position for goggle storage above the brow, with no tools required In-Mold lower Hardbody(TM) wrap - a tough polycarbonate shell is permanently fused to the EPS liner and extended to the interior of the helmet for enhanced durability on technical terrain Deep coverage design - extended lower shell wraps further down the head for comprehensive protection on rowdy trail riding Lightweight at 340g (size M)SPECIFICATIONSWeight340g (Size M)Fit System Roc Loc(R) 5 with Integrated Mips(R)Vents17Shell Construction In-Mold with Hardbody(TM) Lower Wrap MIPSIntegrated Mips(R)Safety Certifications CE EN 1078Material Composition45% EPS, 25% Nylon, 22% PC, 3% PU, 2% Polyester, 2% POM, 1% Silicone Intended Use Trail, All-Mountain Sizing Size Small Medium Large XLHead Circumference (in)20. 1 - 21. 7"21. 7 - 23. 2"23. 2 - 24. 8"24. 8 - 25. 6"Head Circumference (cm)51 - 55cm55 - 59cm59 - 63cm63 - 65cm | Giro | Source Mips Helmet Men's | Size Large In White | Nylon