Regular elastic sheets don't work well on futons mattresses, which are less ridgid and are more irregular in shape than regular mattresses. The Chinch Sheet drawstring sheet is self adjusting and can match the contours of futon mattresses and grip it tightly.
								Viewed for beneath the configuration of the hem and drawstring can be seen holding the sheet tight. For a futon couch this allows the mattress to be folded and unfolded without the need to replace the sheet.