MD Robin Firm Mattress – 8.5” Back to Catalog Mattresses MD Robin Firm Mattress - 8.5” Item Numbers:20T - Twin20F - Full20Q- Queen20K - King Foundations:FND-T - TwinFND-TXL - Twin XLFND-F - FullFND-Q - Queen Category: Mattresses Sub-Category: MD Mattress Related Products MD Bed Foundation - Twin MD Bed Foundation - Full MD Bed Foundation - Queen