OOFOS OOahh Recovery SlidesUnisex SandalsMen's Size 11, Women's Size 13 Black Foam Cut-out detail on front strap New without tagsSee Photos!OOfoam™ technology absorbs 37% more impact than traditional footwear.Patented footbed design reduces stress on knees, ankles and other joints.Closed-cell foam is machine washable and designed to minimize odor.