Browse our products that are perfect for boats We are often asked what is the best foam to use for boat mattresses. Foam used in a marine environment should be melamine free to prevent the foam foam disintegrating and turning to powder. You will find two suggestions below, however they are not waterproof so we recommend a waterproof fabric if being used externally. 3″ (7.6 cm) and below I would recommend the firm blue foam V 384″ (10 cm ) and over I would recommend the Reflex 40 H Both of these grades are highlighted as ‘most popular’ once you have entered your sizes in the home page “Instant quote” calculator. Foam Products for Boat & Campervan Owners For Help & Advice CONTACT US Campervan Mattresses Fabric Fixed Price Cushion Covers Boat V Berths & Mattresses Water Resistant Fabric Foam Cut to Size Need help & advice? Call us today on 0800 731 1168! GET IN TOUCH