100% Synthetic Imported Synthetic sole OOlala style provides the same proprietary OOfoam technology in a feminine silhouette. OOfoam Recovery Technology absorbs 37% more impact than traditional footwear foam, giving your feet the break they need. Our patented footbed will cradle your arches to reduce stress on sore feet, ankles, knees, and lower back. Designed to allow natural motion and relief. Keeping things easy, OOFOS are machine washable.