Tri-Zone Pocket Coil System – Includes 3 zones of support at 1322 coils (head/torso/foot) with thick 2-mm spring coils for extra lumbar support in the torso zone. Complete with 2-inch high density foam support at top at bottom of mattress. Foam Encased Edge Guard – 4-inch hard foam perimeter for added edge/sitting support, with a patterned diamond border. Pillow Top Comfort – 3-inch ultra soft gel foam layered with 1½-inch viscose foam with Double fibre pad for added lumbar support. Gray Embossed Fabric – Stretchable embossed gray coloured fabric with padded diamond border.