glendan firm mattress dual firmness twin-xl: dual side sleep medium firm & firm, memory foam gel green tea for back pain, washable ice silk cover, certipur-us oeko-tex certified, 12 in 80x38 twin xl 12 inch firm is up for auction in Home & Kitchen. The current bid is $6.27, 98% below the $281.38 MSRP, in As Is condition. This auction has ended — similar items appear in live auctions regularly.