Firewire Great White Twin Volcanic 5'9 Surfboard - Futures5'9" x 19 5 8" x 2 5 16" 30. 5L Kelly Slater's new Performance Twin, designed with Mike Woo, is inspired by the lines and angles of the great white shark. With much more rocker than a conventional twin fin, it is a board for waves of a certain quality and fast, vertical surfing. This is a high performance groveler with the paddle and catching of a hybrid, and the on rail performance of a shortboard. It fits where most fish dont it creates speed in