6000 Series Futon Mattress | Peter's Cabin This futon mattress will look good in your hunting lodge. It includes a 6000 Series. This mattress walk complete with premium cover. It constructed of high density foam and 294 coil easy hinge inner spring unit. Easy hinge spring unit allows you to effortlessly convert it from seating position to sofa bed and back. This mattress has Peter's Cabin premium tufted cover.