It comes with secured heavy-duty metal slats that stay in place, without requiring a foundation or box spring; these slats also help with better air circulation to keep your mattress fresher for longer. The black twin Miles includes additional legs and a centre rail provide additional stability to have you sleeping soundly. The base of the Miles can be set to two different heights, giving you the option to have 6.5-in or 11-in under bed clearance – perfect to decide if you want to use the extra space for storing seasonal clothing, shoes, books and magazines. Available in twin size and full size in multiple colours. This bed measures 46-in x 41-in x 77-in.