A cover mattress is a decorative mattress somewhat just like a four-poster bed. A typical cover mattress usually features posts at every of the four corners extending four toes high or more above the mattress. Ornate or decorative cloth is commonly draped throughout the upper space between the posts and a stable swath of material might create a ceiling, or cover immediately over the bed.
A four-poster mattress is a mattress with four vertical columns, one in every nook, that help a tester, or upper (usually rectangular) panel. This tester or panel will usually have rails to allow curtains to be pulled around the bed. There are a variety of vintage four-poster beds extant dating to the 16th century and earlier; many of those early beds are highly ornate and are constructed from oak. An instance of such an early 16th-century four-poster resides in Crathes Castle, which was made for the unique citadel house owners in the Burnett of Leys family.