12 inches Memory Foam Mattress,Twin XL Mattress Bed in a Box Medium Firm, Made in USA - Walmart.com
Lucid Comfort Collection SureCool 6in. Firm Gel Memory Foam Tight Top Twin XL Mattress LUCC06TX45MF - The Home Depot
Amazon.com: LUCID 10 Inch Memory Foam Mattress - Firm Feel - Bamboo Charcoal and Gel Infusion - Hypoallergenic - Bed in a Box - Temperature Regulating - Pressure Relief - Breathable - Twin Size : Home & Kitchen
Linenspa Essentials Twin Firm Gel Memory Foam Hybrid 8 in. Bed-in-a-Box Mattress LSES08TTGFSP - The Home Depot