Axial AX2 Back Protector Add a layer of comfortable protection to your jacket with AXIAL's AX2 Back Protector. Designed for protection while allowing the rider more flexibility with ventilation, creating the perfect day of comfortable riding. Features ergonomic AVP foam technology that forms to your body and is soft to the touch. This lightweight and ergonomically designed armor is CE Level 2 certified. Fits most Bilt, Sedici and Street & Steel brand jackets, and several other brands! Features Soft temperature stabile comfort and flexibility Advanced viscoelastic polymer foam (Avp) for improved shock absorption AVP molecules stiffen at impact for versatile range of performance Lightweight reduces fatigue and aid movement while riding Vented designs provide air circulation to keep you cool and comfortable Impact energy is evenly dispersed More flexible and well ventilated than AX1 CE Level 2 certified / Meets the requirements of CE Norm EN 1621-2 2014 Level 2 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 fit LG back protector Women's Fitment: Bilt: All jackets fit MD back protector, with the exception of the Arcadia Women's Jacket which fits SM back protector Sedici: All jackets fit MD back protector Street & Steel: All jackets fit MD back protector, with the exception of the Nightstar Women's Vest which fits SM back protector Reax: All Reax women's jackets fit MD back protector Other Brands: Measure pocket and choose a size based on the dimensions below Dimensions: SM - 13 x 9.25 X .75 - 10.5oz MD - 15.5 x 11.2 x .75 - 12.75oz LG - 17.5 x 12.75 x .75 - 16oz