POPUP Mattress Size Dual Hardside
If you are ordering replacement dual waterbed mattresses for an existing Hardside waterbed then
measure the internal width and length of the surround frame, not the outside dimension of the frame.
The mattress size would be the same as the sheet size that you would buy, (example 5' x 6'6")
The depth is nearly always the same but worth a quick check of approximately 21cm (8 ½”)
Other sizes not listed are available by request. Contact us