These are triangular fabric pockets at the corners of the fitted sheet. You insert a plastic or wooden pole into the sleeve, which then tucks under the mattress. The weight of the water holds the pole and sheet firmly in place.
Standard department stores rarely carry these sizes. Look for these specific measurements when buying online: Where I Can Buy Waterbed Sheets Guide │Wholesale Beddings buy waterbed sheets
Purchasing waterbed sheets requires more precision than buying for a standard mattress because of unique sizing and specialized attachment systems. If you have a traditional waterbed (with a wooden frame), standard sheets will not fit. 1. Identify Your Waterbed Type These are triangular fabric pockets at the corners
Many waterbed sets have the flat sheet sewn to the fitted sheet at the foot. This "sleeping bag" style prevents the top sheet from being kicked off or lost in the frame during the night. 3. Sizing Guide for Hardside Waterbeds Standard department stores rarely carry these sizes
Because waterbed mattresses move (the "wave action"), hardside sheets often include features to prevent them from slipping off: