The Easy Assembly foundation offers sturdy steel support, quick setup, and consistent mattress support. Get the support your mattress needs with the quick assembly you want. Made with durable steel and a stretch fabric cover, this 5" or 9" box spring is built to last. Plus, it’s easy to maneuver—all parts, tools and instructions are included for better zzz's in under 10 minutes. 1-Year limited warranty. Twin/Twin XL sizes support 350 lbs; all other sizes support 700 lbs.