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.