Bombas Frost Blue and Orange Gripper Slipper Tech Non-Slip Cushioned Brand new without tags, never worn Size medium 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. While our grippers are pretty good at helping prevent slips, they’re not magic. So be careful, and practice good coordination out there.