Our Handcraft Mattress Company value style line of Foam Mattresses are great for Twin bunks, crew or guestroom beds. These Foam mattresses are made of high-density Poly Q Foam; Gel Memory Foam over Poly Q Foam; or a Latex Poly Q Foam combination.  The Foam mattresses are available in 4-6 1/2” thicknesses and includes vinyl marinization on the bottom of the mattress to waterproof the bed.  Each mattress is customized to fit your boat berth and comes with a 5-year limited lifetime warranty.