Both hard-side and soft-side waterbed sheets should have an attached top sheet, but this is the only thing that makes a SOFT-side sheet set special. This attachment is what keeps the top sheet in place throughout the night and is basically the only thing that separates a SOFT-side sheet set with a regular sheet set. Waterbed sheet sets are different, in that, the foot of the fitted sheet is usually attached to the foot of the flat sheet.
Sheet sets typically contain a flat sheet, fitted sheet and two pillowcases. Now that you know the two types of waterbeds, you can begin to figure out what type of bedding you need. They are a little easier to climb in and out of and at first appearance are pretty indistinguishable from a conventional bed.
These soft-side waterbeds tend to move around quite a bit less than hard-side waterbeds, but they do still offer the releaxing water-movement that many of us all love. It is within this cavity that the water blattress is placed. These beds usually will have a heavy duty box frame that supports a thick foam mattress with a cavity on the inside. Soft-side waterbeds are more of a cross between a regular mattress and a water bladder. Therefore, it is critical that you use specially designed waterbed bedding for these types beds.
Typically, these types of waterbeds offer the most water-like movement. This supports the large rubber waterbed bladder that is slept on. Hard-side waterbeds are the older style that have a hard wooden frame which rests on a strong plywood deck. Generally, there are SOFT-side waterbeds and HARD-side waterbeds.