DESIGN & TECHNOLOGY: Unique and patented Active Panel Ventilation system for unprecedented airflow Equipped with MIPS(R) to meet highest impact protection norms AVID Progressive EPS Hybrid shell Adjustable ventilation Removable and washable lining Removable ear pads BOA(R) Fit System Audio Kit Fidlock buckle Weight: 485g (S), 545g (M), 595g (L) SIZING: Small: 52-55cm Medium: 55-59cm Large: 59-62cm