Giant Rail Helmet 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 Giant's most comfortable and lightweight trail helmet yet. Boasting a four-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. Features: Designed with a new, rounder head form for a more universal fit Fully integrated, super-slim Mips Air Node® liner combines maximum rotational impact protection with ultra-lightweight comfort In-molded upper, sub and lower PC shells for optimal protective structure Optimized low and high EPS density Easy to adjust, dual-arm, four-position, snap-in rear height adjustment fit system 21 strategically placed vents for head-cooling airflow Supple and lightweight straps with magnetic Fidlock® buckle system Three-position adjustable visor Broad top surface area for camera or light attachments Sizes: S (51-55cm) M (55-59cm) L (59-63cm)