Natural fibers like cotton, linen, or silk are all very breathable, meaning it is easy for air to flow through them. This makes them popular among hot sleepers, as they won’t trap too much heat. (Be sure to choose a lower thread count cotton sheet, like a percale sheet, to promote cooling.)
Pima
Cotton sheets are a classic choice, offering durability and a crisp, cool feel.
Bamboo:Bamboo is an increasingly popular material for sheets and other bedding. It is a synthetic material made from the pulp of bamboo. To create this fabric, the bamboo can either be physically mashed into pulp or chemically processed. In either process, the cellulose of the bamboo is extracted, spun into thread, and then woven into fabric. This type of fabric is known as a viscose or rayon and can be made with a wide variety of source materials aside from bamboo.



cotton hospital bed sheets. Cotton sheets are known for their breathability, which can help prevent the development of bedsores and keep patients comfortable.
Appearance
What is Linen?
Usually a flat bed sheet is overlocked around the edges to form four seams. One of the seams is wider than the other three and helps with orienting the sheet correctly on the mattress. The wider seam goes at the head end of the mattress. Sometimes the sides do not have seams, but are finished with the selvedge only. When one makes a bed, the patterned or monogrammed side of the top sheet may be placed facing up, or facing down, in which case the top edge may be folded towards the foot of the bed to expose the design.