How to determine the size
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For double-sided mattresses:
Measure the inner clear opening of the bed in width and length. The bed base and mattress will be placed inside the bed frame, so it is important to measure accordingly. -
For single-sided mattresses that fit into the bed frame:
Measure the inner clear opening of the bed in width and length. -
For single-sided mattresses that lie on top of the bed (platform type):
Measure externally from rail to rail: from the top surface of the side panels, both in length and width.