The 3000 Hybrid mattress pairs advanced cooling technology with a medium feel. The Max Cold Cover is cool-to-the-touch, and the UltraCold System paired with Carbon Fiber Memory Foam work hard to absorb excess heat from your body and channel it away. At the same time, the 1025 iComfort Hybrid Support System with BestEdge Foam Encasement supports every curve of your body, so you sleep comfortably. Serta iComfort 3000 13-in Twin Extra Long Hybrid Memory Foam/Coil Blend Mattress with Boxspring Included in White | 500801238-9920