Travasaks on sale at CW.

I've got one of the originals and I like the ability to remove and wash the sheets. But, I camp at all times of the year and I was disappointed there there isn't a bigger difference in warmth/comfort between the summer and winter sides. Also the zippers seem to always get hung up in the flaps on the side which are there to try and block the airflow thru the zippers. I still use it, but now I also just toss in a good sleeping bag for summer or winter depending on when I'm camping. The Travasak is a great idea but I think it needs some updates.