A twin extra long box spring, measuring 39" x 80", adds several inches to your bed's height while also providing additional support to your twin XL mattress. A twin XL box spring is a nest of spring coils framed in wood or plastic that is then covered in fabric. This specific design is what makes a twin size extra long bed foundation so supportive and stable. Upgrade your sleep experience by pairing your twin XL bed with a mattress foundation today.
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