XO Coco Mod Keel TwinFutures XO Coco Mod Keel Twin Fin Set Futures collaborated with North Shore professional surfer Coco Ho on these modern keel fins for Cocos surfboard label XO COCO. XO COCO is a surfboard company designing equipment specifically for and with women. The Coco keel fins are designed with smaller surface area for women and smaller surfers. Built in solid fiberglass construction. Construction Fiberglass Side Fins Area 20. 06 Height 4. 98 Base 5. 57 Foil