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A higher thread count simply means there are more threads per square inch, but what is agoodthread count depends on the style of the sheet. For example, good quality percale sheets usually have a thread count of 180 to 300, whereas good quality sateen usually have a thread count of 300 to 600. This is because sateen requires more threads, due to the weave style, than percale does. 

'Satin is great for sensitive skin and allergy sufferers however it is harder to clean and more expensive than most sheets,' says Bed Bath & Beyond.