In the box item, the size is TWIN XL.
https://www.wayfair.com/bed-bath/pdx/wayfair-sleep-6-firm-innerspring-mattress-w002901396.html
In the box item, the size is TWIN XL.
https://www.wayfair.com/bed-bath/pdx/wayfair-sleep-6-firm-innerspring-mattress-w002901396.html