Created with an all-new head form for a more universal fit and the super-slim mips air node integrated rotational impact protection system, the third-generation rail is our most comfortable and lightweight trail helmet yet. Boasting a five-star safety rating from the world-renowned virginia tech helmet safety lab, the rail also features an accessible, four-position, snap-in height adjustment system, increased ventilation, and supple, lightweight straps with a handy fidlock buckle. Comfort, confidence and zero distractions so you can focus on charging descents while staying cool on tough climbs.Key features:designed with a new, rounder head form for a more universal fitfully integrated, super-slim mips air node liner combines maximum rotational impact protection with ultra-lightweight comfortin-molded upper, sub and lower pc shells for optimal protective structureoptimized low and high eps densityfive-star safety rating from the virginia tech helmet safety lab.Easy to adjust, dual-arm, four-position, snap-in rear height adjustment fit system21 strategically placed vents for head-cooling airflowsupple and lightweight straps with magnetic fidlock buckle systemthree-position adjustable visorbroad top surface area for camera or light attachmentsspecifications:sizes: s 51-55cm m 55-59cm l 59-63cm weight: 360g size m