Attached Waterbed Sheet woven using the best cotton in the world. 100% Egyptian cotton. It's not just cotton grown in Egypt - it is a particular type of long-staple cotton originally grown along the Nile. Egyptian cotton has the longest fibers. That is, when you pull the cotton from the cotton plant and remove the seeds and waxes, Egyptian cotton has longer fibers available for spinning into yarn than other cottons. When intertwining strands of yarn to make a larger product, long-staple cotton has fewer connection points, and therefore a greater percentage of area is the natural softness of the cotton.

The content of percale can vary widely. Though many people assume that "percale" means a polyester-cotton blend, this is untrue. A percale can be made of 100% cotton, 100% polyester, or any combination in between. Even a high thread count 60/40 percale blend won't be as soft or luxuriant as a lower thread count 100% cotton. Also, a dark colored cotton percale will feel stiffer than a lighter colored percale with the same thread count.

Even within cotton itself, there are many differences in grade. Just as grapes grown in certain regions are favored by wine connoisseurs over grapes grown in others, the quality of cotton can be estimated by its origin. Our own domestic cotton is an excellent breed called "pima" cotton. This is a long-staple cotton, and is relatively inexpensive, considering its high quality. The fertile Nile valley which also produces the same breed of Pima Cotton as the United States, calls their more luxuriant textile "Egyptian Cotton." With its longer, silkier, and thicker fibers, this cotton is woven into the absolute best percales. Unfortunately, since it must be imported from Egypt, it carries with it a heavy price tag.

At the other end of the spectrum, some imported percales are very inexpensive, and for good reasons. A combination of low thread count and high ratios of polyester to cotton causes these percales to rip easily, feel rough to the touch, and worst of all, pill. Pilling is that sand-paper feel that sheets can get after washing. If you find your sheets doing this, and are bothered by it, consider upgrading to a higher thread count, and better content. Though this may mean more expense, you really do get what you pay for.

100% Cotton Percales, on the other hand, are more difficult to maintain. They should be washed in cold water, and line or tumble dried. They do tend to wrinkle, and can be expected to shrink 1-2% the first time they are washed. This shrinkage is taken into account when the sheets are manufactured. For this reason, they may fit loosely before laundering, and provide a snug fit afterwards.

Percale fabrics are generally available in widths great enough to provide a sleeping surface without any add-ons or seams. Extremely large or thick mattresses may make add-ons necessary.