I researched duvet covers quite a bit before purchasing my first one--- the light blue version of this duvet cover set--- and I was so pleased that research paid off. This is a beautiful set, and the cotton really makes a difference. My boyfriend usually overheats at night, while I usually get cold, so I wanted to try a duvet with a cotton duvet cover to meet both our needs-- and it worked! The breathability keeps my partner cool and the duvet keeps me warm. I'm considering getting this in the darker blue, too. Highly recommended.