Cosy Flannel: Casper Flannel Sheets Nothing says fall quite like cosy flannel, so why not bring it to the bed? These new Casper Flannel Sheets ($208-$308) are made with 100 percent brushed organic cotton and give you that extra layer of warmth without being too thick and hot. Image Source: casper.com Casper Flannel Sheets $208 from casper.com Buy Now