Serta Brindale 4.0 Firm Twin XL Mattress - Sam's Club
Amazon.com: Legacy Twin XL Size (39"x80"x8") Mattress and Box Spring Set - Fully Assembled, Good for Your Back, Long Lasting and 2 Sided - by Dream Solutions USA : Home & Kitchen
Beautyrest BR800 Medium 12” AirCool Foam Twin XL Mattress