Ensure a high level of head protection for your kids with the Bollé B-SLIDE JR helmet, offering reliable safety and peace of mind. robust Hardshell construction with EPS; Ergonomic, anti-allergenic, breathable material - PADDED LINER technology; Integrated ventilation system with 12 air vents for maximum comfort - AIR EXTRACTOR; Adjustable chin strap - CHIN STRAP technology. Removable lining, can be machine-washed at 30 degrees - DETACHABLE LINING Helmet size is adjustable with the patented CLICK TO FIT system;