The OOlala sandal features revolutionary OOfoam™ technology that absorbs 37% more impact than traditional footwear foam materials to reduce the stress on your feet and joints. This technology aids in the recovery process and creates an incredibly comfortable sandal you can wear anywhere. Reduces stress on sore feet, knees, and back Enables more natural motion Minimalist construction for light weight Machine washable OOFOS are made in whole sizes. We recommend sizing up if you’re a women’s half size. The store did not give a crap about helping you find them on their store website when they did not have your size! Pitiful customer service!