The Leatt 5.5 neck brace is Leatt s best seller, why, because it has the same adjustability as the class leading 6.5 but manufactured from reinforced polyamide so great value. The brace is designed to allow the forces during an accident to be reduced & transferred through the brace into the strong muscles of the body rather than the small fragile bones in the neck. Super comfortable & extremely durable, this brace will work with most body shapes & sizes. Feel protected & ride with complete confidence. For the same adjustability but a super lightweight carbon fiber chassis check out the 6.5 Features Independently lab & rider tested, proven to reduce neck forces & neck injuries through transferring the load during an accident away from the fragile bones in the neck. Up to 89% reduction in critical cervical spine injuries Collarbone injuries up to 45% more likely without a neck brace Engineered collarbone cut-out to keep your helmet rim away from your most fragile bones Composite matri...