Freeflow softside mattresses contain a single bladder full of water. This means there is a lot of motion from the water in the bladder, especially when you are sharing the bed with someone else. Before buying this type of waterbed mattress, consider whether you can tolerate the movement.
Waveless softside mattresses have less motion than freeflow mattresses. These bladders contain fiber inserts or baffles. Baffles are hydraulic cylinders designed to slow the movement of water in the mattress. However, they do still ripple and move.
There are three basic types of waveless softside mattresses: single, double, and tube bladders. Single bladders contain one bladder. Double bladders contain two bladders. Tube bladders contain multiple bladders that look like long tubes. The tubes can make moving your waterbed much easier, because you can remove the individual tubes from the mattress itself instead of removing the water from the bladder.
Sleep number waterbed replacement mattresses can be used in place of a softside waterbed mattress. This is sometimes a good alternative for those who are not fully satisfied with the movement and comfort of their softside waterbed mattress. Health conditions or back problems can also be a reason for having to make the switch.