How to determine the size
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For double-sided mattresses:
Measure the bed’s clear internal opening by width and length. The slatted bed base and mattress will be placed inside the bed frame, so it is important to measure along it. -
For single-sided mattresses that fit into the bed frame:
Measure the bed’s clear internal opening by 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 lengthwise and widthwise.