Alan's 5.5" Halo Center fin and 4 1/8" side bites fin setup on an HI4 Surfboard サーフボードのフィンセットアップ X Facebook はてブ Pocket LINE コピー 2025.08.24 Just talked to Alan about his HI4 9’1″ setup—switched to Halo fins (5.5″ center, 4 1/8″ sides) and it came alive! More drive …