Cosmic SLS

This is the SUP wave hardboard that does it all, and makes you better.

Shape & Bottom Design

The round-point nose delivers stability and clean wave entry at paddle speed, while the pulled-in moon tail keeps things tight and responsive when it counts. The bottom shape drives the performance: a mono-concave up front generates effortless speed and keeps the board alive through weaker sections, transitioning into a double-concave through the mid-section for maximum stability and balance. Toward the tail, an opening V releases water cleanly — freeing the tail for snappy pivots and that loose, fluid feeling through the end of every turn.

Accelerate. Drive. Release. Repeat.

4+1 Fin Box System — Unmatched Versatility

Four multi-fin boxes plus a central US box make the COSMIC SLS genuinely four different boards in one.

Thruster (as delivered) — Balanced all-around performance from waist-high to well overhead. The universal setup: precise, controlled, and high-performing across all conditions.

Quad — Maximum grip. Four fins deliver maximum grip and lateral hold for critical, powerful surf where traction is everything.

Twin — Ultimate looseness. The skatey, flowing twin-fin feel for smaller, softer surf. Draw long arcs or snap hard pivots — the board breathes and surfs with a freedom no other configuration can match.

Twin + Trailer — A small center fin adds just enough grip and direction to the twin setup for those in-between conditions where a little extra control makes all the difference.

FULL CUSTOM SLS Construction

Strong. Light. Superior.

Built with Biax-Composite-PVC Sandwich technology, every EPS foam core is individually CNC-milled — not pressed into a mould. The result is a board that is lighter and stiffer than anything made using standard semi-custom production, with an individual laminate layup optimised for each size. Light where it matters. Strong where it counts.

Who is the COSMIC SLS for?

The COSMIC SLS is built for newcomer to intermediate to advanced SUP surfers who are serious about wave performance. If your quiver currently contains multiple boards for different conditions — or if you've been searching for one board that can genuinely replace them — this is it.

DUOTONE COSMIC SLS - YOUR ALL-WAVE PERFORMANCE SUP HARDBOARD