Bombas gripper slipper for men Size XL (size US 13-15) Brand new Fabric travel bag Half sock. Half slipper. 100% cozy. Made with a lighter footbed for just enough cushioning, these Gripper Slippers have an ultra-warm brushed lining, special grips on the outside designed to help prevent slips, plus a separate travel bag that makes packing a breeze. You may never want to wear real shoes again.