9" Spring Stompfin™

The standard center fin included with every StompBox 2.5 board. The 9" Spring StompFin ships with the Atcha 96, Atcha 86, Rado, and Radito. Other retractable fins rely on gravity — in current, that means the fin bounces and shudders instead of holds, costing you tracking and control. The StompBox is different: the integrated spring at the hinge holds this fin locked at full depth at all times, not gravity. Hit a rock and it deflects cleanly, springing back to full depth before your next stroke — no need to pull it manually. Zero wobble, zero bounce.

This is Hala's stiffest StompFin compound yet, delivering maximum tracking performance for all-around river paddling. It's the right fin for Class II–IV — big enough for real drive and tracking, spring-loaded for reliable retraction on rock contact.

If you have a StompBox 2.0 board and want this upgraded spring mechanism, the 2025 StompBox Booster Kit converts your 2.0 to 2.5 performance. Lost or replacing a damaged fin? This is your replacement. See the full Hala fin lineup — including the 9" Tracking StompFin (flatwater, fishing, expedition) and 4.5" StompFin (tracking without depth, quick side to side).