Hamden Extra Firm Mattress Hamden Extra Firm Mattress HXTF-50 Queen Mattress 50-GDF Queen Grey Deluxe Foundation HXTF-66 King Mattress 33XL-GDF King Grey Deluxe Foundation Features: New Naturalcool™ 1″ Aircool® Faom 1/2″ Firm Comfort Foam 1/2″ Beautyrest® Charcoal Memory Foam 1″ Firm Comfort Foam T1 Pocketed Coil® Technology Warranty: 10 Year Limited Warranty Free