2025 Duotone Crush SLS

The 2025 Duotone Crush SLS is a dedicated prone foil board built for paddling into waves and riding them on a hydrofoil. Produced by Duotone, one of the established names in wind- and water-sports equipment, the Crush SLS sits in the brand's SLS (Strong Light Superior) construction tier — a lightweight layup that prioritizes low swing weight and direct board feel. Available in two compact sizes (4'6" and 4'10"), it is shaped around a flat rocker profile, wide outline, and thin deck designed to maximize paddle speed into small or marginal surf.

Duotone positions the Crush SLS as a purpose-built prone foiling platform rather than a multi-discipline crossover. The board omits footstrap inserts entirely to save weight, and its tail features cut-outs intended to let the board release from the water as early as possible during takeoff. A single concave running to a flat exit through the bottom adds glide during the paddle phase, while a slightly raised nose angle helps prevent the board from catching water on touchdowns.

• Sizes available: 4'6" / 4'10"
• Volume (4'6"): 30 L
• Volume (4'10"): 40 L
• Length (4'6"): 137 cm
• Length (4'10"): 147 cm
• Width (4'6"): 18.5" (47 cm)
• Width (4'10"): 19.75" (50 cm)
• Weight (4'6"): 3.04 kg (±6%)
• Weight (4'10"): 3.40 kg (±6%)
• Recommended rider weight (4'6"): under 65 kg
• Recommended rider weight (4'10"): under 90 kg
• Construction: SLS (Strong Light Superior)
• Foil attachment: 2× US foil tracks (carbon)
• Footstrap inserts: None

The Crush SLS targets intermediate to advanced prone foilers who paddle into ocean swells rather than relying on a wing or tow-in assist. Its flat rocker and wide nose-to-tail outline are geared toward catching small, weak waves — the kind of conditions where paddle speed and early planing matter most. Soft rails and a forgiving outline help during touchdowns and whitewater sections, making the board suitable for riders still building confidence with surface contact while foiling.

Duotone suggests the 4'6" for riders under 65 kg and the 4'10" for riders up to roughly 90 kg. The larger size adds 10 liters of volume and an extra 10 cm of length, giving heavier or less experienced prone foilers more paddle power and stability. Neither size is aimed at beginners learning to foil for the first time; some prior foiling experience — whether from wing foiling, kite foiling, or surf foiling — is assumed.

Within Duotone's 2025 foil-board range, the Crush SLS is the dedicated prone option. It sits alongside the Skybrid SLS, which covers wing foiling and freeride disciplines with footstrap compatibility and a different rocker profile suited to powered riding. Riders who want a single board for both winging and prone work would look at the Skybrid; the Crush trades that versatility for a shape optimized purely for paddle-in wave catching. Above both in Duotone's hierarchy is the D/LAB construction tier, which uses a hollow-shell composite layup for even lower weight, though at a higher price point.

For buyers comparing across brands, the Crush SLS competes with other compact, low-volume prone foil boards such as the Armstrong Midlength Prone and the Appletree Applino Prone. Its sub-3.5 kg weight in both sizes and the carbon foil-track system are notable in this segment, where every gram of swing weight affects how the board feels once airborne.