Eliminate the need for a box spring with the 18-inch Premium SmartBase by Zinus. The Premium SmartBase works especially well for lower profile (6”, 8” and 10”) mattresses, giving your mattress a lift for extra storage, as well as ease of use. Uniquely designed for optimum support and durability, the strong steel mattress support has multiple points of contact with the floor for stability and prevents mattress sagging, extending mattress life. The Premium SmartBase is 18 inches in height with 17 inches of clearance underneath for storage. With plastic caps to protect your floors and an innovative folding design to allow for easy storage and maneuvering, the 18” SmartBase is well-designed for ease of use. Worry-free 5-year limited warranty. Size: King. Color: Black.