Mares X-Wing Freediving Fin Foot PocketX Wing freediving fin foot pocket. Lightweight, ergonomic and ultra responsive, they are designed to be worn with or without boots. Sold individually. X Wing fin foot pockets are the original spare parts for your freediving fins. The package contains 1 foot pocket. The key features of the X Wing fin foot pocket are: Foot pocket without side profiles Extremely light size 42 43, 270g of weight Pre shaped 30 angle Ultra reactive ergonomic foot pocket