2 Layers, 2 Zones, (Body and Heel Zones), 450 lb weight rating. - 5 year Full Non-Prorated Cover & Core Warranty. - Interface Pressure tests show 75% Pressure Relief, 25% Pressure Redistribution Capabilities. - 100% Medical Grade Fabric and High Density foam; Exceeds OEM bed frame manufacturer's mattress specifications. - Firm Internal foam side rails; 4 Reinforced Handles; Low Slip Bottom. - Fluid proof Clam-shell cover design - 4 way stretch or 70D Nylon fabric. - All materials are: anti-bacterial, anti-fungal, anti-static; stain and tear resistant, radiolucent, & Latex and artifact free. - All materials exceed fire standards Cal TB 117, 16CFR-1632 - Optional fire barrier to meet Cal TB 129, 16CFR 1633, BFC IX 11. - No Cost Options Are: No Zipper, No Handles, No internal foam side rails.