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Prized for its warmth, flannel is primarily popular as a winter material. You can assess how thick and heavy a flannel sheet is by the GSM, or grams per square meter. A GSM of 130 to 135 is considered lightweight, 140 to 150 is considered midweight, and 160 or more is considered heavyweight. 

'Microfiber sheets are very soft, wrinkle-free and typically less expensive than traditional cotton,' says Bed Bath & Beyond. 'However, it can wear down more quickly and is prone to pilling.'