The tunnel sizing is the size of the opening for your waist. The cockpit length and width should be measured on your boat's cockpit and is the maximum size that the splash deck will fit.
| Cockpit Size | Length | Width | Tunnel | |
| XS | 1.2 | 32.5" - 36" | 18" - 22" | 20" - 37" |
| S | 1.4 | 34" - 37.5" | 18" - 22" | 20" - 39" |
| M | 1.7 | 36" - 38.5" | 18" - 22" | 20" - 43" |
| L | 2.2 | 37.5" - 40" | 18" - 23" | 22" - 45" |
| XL | 2.5 | 38.5" - 41" | 18" - 24.5" | 22" - 45" |