Boat & Marine Foam
Foam for boat, yacht and marine cushions, cut to order in our UK factory.
The one decision that matters: will it get wet?
Get this wrong and the cushion rots. It is the only marine foam question that really counts.
| Where the cushion lives | What you need | Why |
|---|---|---|
| Dry interior — saloon, cabin berths | Standard firm upholstery foam (33H, 39H, 42H) | Comfortable, supportive, Crib 5 fire rated. It will absorb water if it gets wet, so keep it dry. |
| Cockpit, deck, anywhere exposed | Reticulated foam | Open, mesh-like cell structure lets water pass straight through and drain out. Dries quickly instead of staying waterlogged. |
| Buoyancy, protection, wet storage | Plastazote LD33 closed cell | Sealed nitrogen-filled cells. Waterproof and buoyant — water cannot get in at all. |
Why standard foam fails outdoors
Standard polyurethane upholstery foam has an open cell structure that holds water like a sponge. On a cockpit cushion it will soak up spray and rain, stay damp, and eventually degrade and smell. It is not a durability problem you can solve by buying a denser grade — it is the wrong material for the job. Use reticulated foam, which is designed so water runs straight through and out.
See our foam FAQs for more, or compare every grade in our foam grade comparison.
