Brooks England Foldable Helmet SAFETY FIRST - Meets all EN 1078 and CPSC certifications for impact resistance and features an in molded construction DESIGNED IN ITALY - Quality Craftmanship, Quality Materials, and Amazing Aesthetics set this helmet apart from any other helmet on your group ride LIGHTWEIGHT, COMPACT, HIGHLY VENTILATED - The accordion like design lends itself to being foldable to reduce it's size by 20% while also providing amazing ventilation. MEDIUM: 55-58 CM LARGE: 58-61 CM weighs just 330 grams ADJUSTABLE LEATHER STRAP INCLUDED - Can be used as a trouser ankle strap or to carry the helmet when off the bike COMFORTABLE INTERIOR PADDING - Detachable, Breathable, and Washable