
Commonly used in North America, but uncommon in Europe, a top sheet (also known as a flat sheet), is the sheet that separates you from your comforter, blanket, or quilt. In Europe (and very slowly catching on in the United States), the duvet cover takes the place of the top sheet.
LONGSHOW's bamboo fiber bedding sets are made from carefully selected bamboo fibers from sustainably managed bamboo forests. The fibers are woven into soft, breathable fabrics that offer optimal comfort and promote a restful sleep environment. Bamboo fiber has excellent moisture-wicking abilities, keeping users cool and dry throughout the night.
Wholesale hospital T130 percale bed sheet

Silk
Article: The History of Bedding
The flat sheet is hemmed identically on three sides and has one larger hem on the fourth side. The wider hem folds back over your blanket, coverlet, or duvet, and can be finished with a simple stitch, hemstitch, or embroidery.
Article: The History of Bedding
Other fabrics like bamboo, Tencel, or other semi-synthetics are temperature-regulating, meaning they maintain a naturally cooler temperature and adjust with your body temperature. These are fantastic for keeping cool when it’s hot — especially because they are often moisture-wicking, too.
Medium Weight Duvet Insert
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Know the difference between pillows, linens, and blanket types