If you live in an area that has very cool to cold evenings, then these are for you! They are thick and soft and keep us warm high in the Rockies. However, if you live in a very humid area, these would be way too heavy for summer or warm weather usage. I am using these to replace all the flannel sheets we have acquired before. That is the perfect use, but don't plan on these to replace regular sheets except in cooler areas. They do wrinkle a bit, but not bad. They are well worth the effort if you want great sheets for cool nights!