MICROSOFT Performance Base Case [13.5-inch Screen] Feather-Light Rugged [Ice] Military Drop Tested Laptop Case Urban Armor Gear Surface Book cases combine light-weight materials in a rugged, low-profile design to provide maximum protection for your Surface Book. Our case utilizes rubber bumpers to provide shock protection and strategically placed tactile grip for added grip. With a Dual Lock screen closure system and impact resistant shell, UAG is able to provide MIL-SPEC protection for your Surface Book. ***This product fits Surface Book 3, 2, 1, & Performance. Packaging does not state the compatibility for Surface Book 3 Compatible with only the 13.5-inch model.