Exactly what I was looking for.

Verified Buyer Reviewed by MaineWoods from Central Maine on Wednesday, November 15, 2017
I live off-grid in Maine. We heat with wood heat and in the winter indoor temps can drop to 50F by morning before we start the woodstove. These sheets are great for staying warm in winter, the thick flannel makes a big difference. I have not owned them for long enough to comment on durability but the material and workmanship seems excellent, so I expect they will last. I bought the blue sheets - which looks a lot like unwashed denim, the color and texture was a perfect match for my bedroom. I would not recommend these for a warm climate or if you keep your heat turned up to 68F at night.
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