iSideSleep Therapeutic Mattress &ndash; Latex or Memory Foam for Side Sleeping Comfort. MADE IN THE USA! Revolutionary therapeutic inclined Latex or Memory Foam mattress contoured to shape of your body. Side-Sleeper Shoulder-Saver Comfort. Spinal alignment and decompression. High-end memory foam, antimicrobial cover, allergen and bed bug resistant. Combine our Twin XL Mattress with any other Twin mattress for a King size couple bed. Custom 700TC Sheets, Body Pillow with 500TC cover included.