Commercial-Quality Liferafts - USCG Approved 3 USCG Approvals. [ see below ] Revere's SeaMaster offers double buoyancy chambers manufactured from a specially formulated polyurethane (PU) proofed nylon fabric. This fabric is highly resistant to abrasion and impervious to corrosion in the marine environment. Far more durable than rubber-based fabrics, the reduced need for repairs results in considerable savings in servicing costs. Welded seams, significantly stronger than glued seams, give the raft an extremely rugged construction. All 8-man SeaMaster liferafts include a boarding ramp. A lightweight, waterproof, durable valise is available for all sizes of SeaMaster liferafts. Valises are made of a high-visibility material. When packed, the valise design and shape make it easy to launch the raft overboard. A space saving low profile fiberglass container is also available for all SeaMaster liferafts. The container is secured to an aluminum deck-mounted stowage cradle with a hydrostatic release allowing for both manual and automatic deployment.