Purple 5-inch Twin Extra Long Flat Foundation provides a low-profile, support-forward base that keeps your Twin XL mattress stable night after night. It features a polyurethane core that promotes even weight distribution and resists sagging, offering a steady platform for sleep and improved mattress longevity. The flat 5-inch profile works with standard bed frames or as an alternative to a box spring for straightforward setup and reliable support. Choose this foundation to simplify bed assembly, protect your mattress, and maintain consistent comfort over time.