Choosing the right size for cotton sheets depends on your mattress dimensions. Standard sizes include Twin, Full, Queen, King, and California King. To ensure a good fit, measure your mattress's width, length, and thickness (depth). Look for sheets labeled with deep pockets if your mattress is thicker or has a topper. Most sheet sets include a fitted sheet, flat sheet, and pillowcases, so pick a set that matches your bed size. Properly sized sheets help keep your bed neat and comfortable.

Thread count refers to the number of threads woven per square inch of fabric. For cotton sheets, a thread count between 300 and 600 is often considered ideal for balancing softness and durability. Sheets with thread counts in this range tend to feel smooth and last longer with proper care. Extremely high thread counts may not always mean better quality, so also consider the type of cotton and weave when selecting sheets.

Common cotton fabrics for bed sheets include Egyptian cotton, Pima cotton, and standard cotton. Egyptian cotton is known for its long fibers, which produce smooth, strong, and luxurious sheets. Pima cotton also has long fibers and offers softness and durability but is generally more affordable than Egyptian cotton. Standard cotton sheets may have shorter fibers and can be less smooth but still provide comfort and breathability. The weave type, like percale or sateen, also affects the sheet's feel and finish.