Diving Training Flipper,Swimming Practice Accessory,Swimming Fins Flipper,Adult Dive Fins,Swim Flipper,Swim Training Fins,Short Floating Fins,Snorkeling Flipper,Open Heel Fin,Adjustable. - Soft foot pocket, flexible enough for barefoot, but can also be worn with fin socks or dive booties which help to protect a diver's feet from the cold.