Not too bad at all - Smith Boogie Regulator

They still fog up but take considerably longer to do so than my other low profile goggles due to the vent. I wore them while cutting my grass with a mower and they fogged up after about 45 minutes.
Pros: lightweight and low profile
Cons: strap is fidly to adjust

This review was written in the old system and had content requirements that are different than reviews written today.