Pamper your feet indoors with these soft and comfy spa-style mule slippers with hook-and-loop adjustable closure. Featuring the same tried and tested FMT Technology as our sandals active and closed-in styles VIONIC slippers offer everyday support for at-home wear. Upper: Textile. Footbed: Textile Covered EVA. Outsole: TPR with Textile. Our innovative podiatrist-designed FMT Technology provides superior orthotic support relief and stability which helps realign the feet back to their natural position. Research supports FMT Technology's success in reducing over-pronation which can help relieve associated common aches and pains such as heel pain (plantar fasciitis) knee pain and lower back pain.