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Foundations, also commonly called box springs, are the most common way to support your mattress.
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Corsicana Hotel Grey Twin Extra-Long Size Foundation
Twin Extra Long Size Basic Foundation / Box Spring Available only in 7" Mid-Profile
Northwest Bedding Twin Extra Long Size Black Foundation
A standard foundation for products by Northwest Bedding but also sold individually. Available in the Standard 9" size, and the Low Profile 5" size.