Triangle Boat Cushions — Custom Size & Marine Fabric

Angled corners and pointed bow sections are the last spots on a boat that get properly cushioned, because no standard shape fits and local marine upholstery is slow and pricey. USCUSHION makes every triangle boat cushion to the three side lengths you provide, cut and sewn to sit flush against all three edges.

Why customers choose us:

• Exact-fit marine cutting: Enter all three side lengths and the triangle type (right or equilateral) and we cut to match, so the cushion sits flush without trimming or shimming.
• Comfortable high-density foam: We build with supportive high-density foam that holds its shape season after season, not the thin factory foam that goes flat. Want it softer or firmer? Note it in your order and we cut to match.
• No exotic foam needed: For a seat that sheds rain and dries between trips, which is most boat seating, you do not need special drain-through foam. High-density foam under a marine cover handles sun, rain, and a wet swimsuit. Just let the cushions air out and keep the boat ventilated.
• Your choice of marine cover: Choose our marine-grade fabric, water- and UV-resistant and built for on-water use at a friendlier price than the premium names, or wipe-clean marine vinyl that sheds water and suits wet or fishing use.
• Matches your existing set: Order in the same cover as your other boat cushions so the triangle piece blends into the full seating layout.
• Removable YKK zipper covers: Covers unzip for end-of-season washing or a future refresh, so you can update the look without buying new foam again.

See more in our boat & marine cushions collection.

Triangle boat cushions solve a specific problem that rectangular and square pads never can: the angled corners, pointed bow sections, and wedge-shaped seating areas that appear throughout most boat interiors and decks. Whether you need to fill the corner of a cockpit bench, pad the angled section at the edge of a V-berth, or add cushioning to a pointed bow lounge area, a triangle cushion cut to your exact dimensions fits flush against all three sides without gaps, overhang, or improvised trimming.

Perfect for:

• Bow lounge corner cushions where the deck seating meets the hull at an angle and rectangular pads leave a bare triangular gap
• V-berth edge cushions that fill the pointed forward section of the berth where the two main pieces meet the hull
• Cockpit corner seat cushions where the bench angles into the coaming and standard rectangular pads cannot follow the geometry
• Center console and pontoon boat corner seating where the deck layout includes angled or wedge-shaped seating platforms
• Custom and semi-custom hull builds where the interior design includes triangular seating sections as part of the overall layout
• Filler cushions that complete a full seating set by covering the remaining angled sections after the main rectangular cushions are in place

Every order can include matching rectangular or square cushions in the same marine fabric and foam density, so the triangle piece integrates cleanly into the full seating set without a visible fabric or color mismatch.

Triangle boat cushions sit in the same harsh conditions as every other marine cushion on board: full UV exposure, salt spray, and the mold pressure that builds up in covered or below-deck spaces between outings. Our marine fabric range is selected specifically for on-water use, covering both fully waterproof vinyl options and high-performance woven fabrics for interior bow and berth applications.

All fabrics are:

• UV-resistant and solution-dyed to hold color through full seasons of direct sun in open water conditions without fading or chalking
• Water-resistant and quick-drying so triangle cushions recover fast after spray, rain, or boarding from the water
• Mold and mildew resistant for cushions stored in covered bow areas and below-deck spaces between outings
• Available in marine-grade Sunbrella Horizon fabric, which provides 4-way stretch for a clean fit around the angled edges of a precision-cut triangle cushion
• Sewn with YKK zippers on removable covers so fabric can be washed at the end of season or replaced without buying new foam

For triangle cushion color, matching the existing rectangular and square cushions on the boat is the most important factor since the triangle piece is a filler or accent piece rather than a standalone seat. White and navy are the most common base colors on center console and sailboat interiors. Charcoal and gray work across the widest range of hull colors and suit both fishing and leisure boats. For bow lounge areas where the triangle piece is more visible as part of the sunpad layout, a two-tone approach pairing a neutral triangle with a contrasting main cushion color adds visual interest without looking mismatched.