OOFOS OOlala Women's Recovery Sandals Black SyntheticThe OOFOS OOlala is a casual women's thong sandal made with revolutionary OOfoam technology and features a streamlined footbed. These OOFOS OOlala Black Synthetic Women's Sandals have the following features: Revolutionary OOfoam technology absorbs 37% more impact than traditional footwear Reduce the stress on your feet and joints Patented footbed design reduces stress on knees, ankles and other joints Closed cell foam is machine washable and designed