The innomax genesis 900 (g900) super wave less lumbar support sponge bed waterbed mattress eliminates motion to provide custom tailored hydrodynamic sleep pampering every curve of the body, resulting in virtually perfect ear to ankle body alignment as defined by physicians and chiropractors for the ideal sleeping posture. the deep fill g900, is designed for use with minimum 9x72x84" rigid side or wood box frame. the g900 sponge bed, provides true full depth flotation and is enhanced with mid body lumbar support. features include; 24 mil premium paralyzed vinyl, ultra contouring sculpted body profile low tension vacuum formed sleep surface, pressure relieving sponge support, air release valve, 3 dimensional multi-laminate reinforced corners, 4-way tethered support system, recessed l-seam construction and a thermally efficient black bottom. the sg1 (specific gravity 1) low tension mattress (ltm) surface features responsive levels of support for your body's varied levels of need; for th.