Double size is a common term that in the UK refers to a standard size 4'6"/140 cm x 6'3"/190 cm.
Enough to sit or sleep two people comfortably.
When referencing futon frames this size can mean for 2 or 3 seat frames. 2 seat double are in 3 sections called tri fold. 3 seat folding frames are 2 sections.
Because this size is used so much almost all reference on this website will be sofa bed or bedding related.
Especially relevant is Double mattress, probably our most popular size.
In conclusion it's worth mentioning that the standard size in the UK is slightly different to Europe. 137 cm is the regular size in use for width measurement.
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