Amazing! I wore this for a 5k and just a tip: it's like wearing a sauna suit even with the fan so don't recommend doing that. I'm 5'2" and this fit perfectly. If you're taller there's another viewing slot higher up but it's under the mouth where it curves so it might be a little uncomfortable for someone a lot taller. I didn't have any problems with the fan, i was able to use the same batteries all day with no issue. Fast delivery and will definitely use this again!