I'm a "hot" sleeper and even the Level 1 goose downs were too hot for me.  The "down alternatives" with polyester material were even worse...  I'd wake up sweating.  I didn't realize how difficult it would be to find a cotton comforter to insert into my duvet cover that wouldn't burn me up.  Also, most of the comforters were larger than my cover so they would have bunched up.  This is the one.  I inserted this into a 100% cotton duvet comforter and put it on top of my cotton top sheet... pure heaven.  I'm not too hot nor too cold.