Axial AX1 Back Protector Axial AX1 Back Protector has been designed to add a layer of protection that is comfortable to wear. Features ergonomic AVP foam technology that forms to your body, is soft to touch that moves with your body. The protection keeps your skin protected, and the comfort will keep you riding longer. The lightweight design is CE Level 1 certified. Fits most Bilt, Sedici and Street & Steel brand jackets and several other brands! Features: Soft temperature stabile comfort and flexibility Ergonomic AVP foam technology forms to your body and is soft to the touch Lightweight, ergonomic design Impact energy is evenly dispersed CE Level 1 certified Meets the requirements of CE Norm EN 1621-2 2014 Level 1 Men's Fitment: Bilt: All jackets fit MD back protector Sedici: All jackets fit MD back protector Street & Steel: All jackets and vests fit MD back protector Reax: Xs-Md jackets fit MD back protector, Lg-3Xl men's jackets fit LG back protector Other Brands: Measure amor pocket and choose from Axial dimensions listed below Women's Fitment: Bilt: All jackets fit MD back protector, except the Arcadia which fits a SM back protector Sedici: All jackets fit MD back protector Street & Steel: All jackets and vests fit a MD back protector, except the Nightstar Vest which fits a SM back protector Reax: All Reax women's jackets fit MD back protector Other Brands: Measure amor pocket and choose from Axial dimensions listed below Dimensions: SM - 13.75 x 9.75 x .5 - 8oz MD - 15.75 x 11.5 x .5 - 9.7oz