Box Spring Foundation

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King Koil's box spring foundation is crafted with durable Nordic hardwood framing and a semi flex steel inner body to provide the essential support for a peaceful night's sleep. Fe atures Available in 2 profile heights: Standard 9", Low 5" Made in USA Size Availability Twin: 38" x 75" Twin XL: 38" x 80" Full: 54" x 74" Queen: 60" x 80" King: 38" x 80" (each piece/2-piece foundation) CA King: 36" x 84" (each piece/2-piece foundation) * Product sizes are listed in Width x Length. All measurements are approximate and may vary slightly Compatible King Koil Mattresses Willow Haven (Plush) Terra (Firm, Medium) Show more