I have used the sport cat and have never noticed any smell, but then again, my mose is not as good as a deer's.

BUt if you look at it this way, you will most likely only going to use it on cold days, the pop-up blind will become warmer then the outside air, any air that escapes from it, scent included will rise quickly because it is warmer. The faster it rises into the air, the less chance the seer will have to notice any scent, including your body odor.

Some people have said that deer can see differences in heat waves, well I do not know about that but many people use heaters and have good luck.