The Kirkland Signature Hope Bay Cal King Foundation is a premium bed base designed to pair with the Hope Bay mattress collection, sold exclusively at Costco and manufactured by Stearns & Foster. This 9-inch foundation provides a firm, stable support surface that extends mattress life, evenly distributes weight, and raises the sleep surface to a comfortable height.

Sized for Cal King beds at 72 by 84 inches, the foundation is engineered to work with compatible Cal King mattress frames and platform bases. Its solid construction minimizes flex and ensures proper spinal alignment throughout the night. The design complements Stearns & Foster's quality standards, which are reflected across the Hope Bay collection through features such as the IntelliCoil Advanced innerspring system and PrecisionEdge support perimeter found in the companion mattress.