LS2 Women's Back Protector Compatible with all LS2 Jackets, the LS2 Women's Back Protector incorporates ViscoFlex Material. This innovative material is soft and high-performing, transforming into a hardened state upon impact for enhanced protection. Features: ViscoFlex Material soft, high performance formula Level 2 protection EN 1621-2:2014 Compatible with all LS2 Jackets Note: Medium through 5XL Women's jackets should use the Sm-Lg Men's Back Protector