L.L.Bean Premium Supima Flannel sheets are 100 percent Supima cotton, which owners praise for being soft and warm, yet resistant to pilling and wrinkling. They're available in a choice of six colors and in every mattress size except California king. For those looking for bed sheets that are soft (but not as warm as flannel), reviews recommend Wamsutta Dream Zone Sheets (*Est. $160 for a queen set), which are Egyptian cotton sateen with a 750 thread count.
Flannel bed sheets are not included in expert reviews like the more popular cotton sateen or percale. We did, however, find good insight by owners at LLBean.com, where the sheets are sold exclusively.
About 60 user reviews for L.L.Bean Premium Supima Flannel result in a high average rating of 4.8 stars out of 5. Reviewers are happy with the soft, heavy feel of the flannel, which also "washes beautifully." A video at the site touts the quality of Portuguese flannel.
Review: Premium Supima Flannel Sheets, Contributors to LLBean.com