Slim Box Spring, 4-Inch Charcoal Upholstered, Rounded Corners.
This slim 4-inch foundation offers a sleek, low-profile look with its charcoal grey upholstery and protective rounded corners.
By Eliza Bush in Queen Box Springs & Foundations | Source
For those who prefer a modern, low-slung bed, this four-inch foundation provides essential mattress support without the bulky height of traditional box springs. The charcoal upholstery creates a clean, finished border that blends seamlessly with dark frames or provides a crisp contrast against lighter linens. Its low profile is ideal for pairing with thick, high-crown mattresses.