Quality tested 21.2 gauge (0.52mm) waterproof flocked top with 15 gauge (0.38mm) vinyl sides and bottom. * Approximately Twin size: 40" x 80" x 18 1/2" (102cm x 203cm x 47cm). Sizes can and do vary. We do not guarantee dimensions. * Mattress is raised 16 1/2" (42cm) from the floor for convenience * Patented Wave Beam construction creates a uniform sleeping surface that is guaranteed to give you a good night"s rest. * Inflates and deflates with built in electric inflation pump in about 2 1/2 minutes.