Cutting edge SAS-TEC material is intelligent armor constructed from smart molecules. It has earned the highest CE rating available (CE level 2) During an impact, the armor freezes and hardens, absorbing the shock and distributing its force over a large area to reduce the risk of fractures SAS-TEC Armor has a soft and pliable exterior (as opposed to rigid KNOX armor) which offers a great deal of comfort and mobility. This protector is anatomically designed and fitted to provide superor spine and back protection as well as the base of the neck /between the shoulder blades. SC-1/11 fits Women's Turbine Jacket SC-1/12 fits REV'IT! Cayenne Pro Jacket and Turbine Jacket SC-1/12 included with REV'IT! Infinity Suit REV'IT GoreTex Jackets have different shaped back protector pockets depending on the size of jacket, see the size chart for fitment information SC-1/16 should only be used for XYL or larger Gore-Tex Jackets SC-1/11 Measurements (approximate) Height 15 3/4 Width (at widest point) 13 Thickness 1 SC-1/12 Measurements (approximate) Height 19 Width (at widest point) 11 Thickness 1 SC-1/16 Measurements (approximate) Height 21 3/8 Width (at widest point) 13 3/8 Thickness 1