I had a chance to use these bandanas for a month or two before the bugs went away for Winter. I put one on my head and the other wrapped around one leg while wearing shorts. It definitely cut down on the mosquito bites I was getting, but only for the covered areas. I can't remember right now what the name of the active ingredient is, but prospective buyers should know that it doesn't repel bugs anywhere but where the bandana is. I guess I was supposed to know that because the Description didn't say it, and I couldn't find anywhere that ExOfficio said it either. I wasn't expecting full body repellent properties from two bandanas, but I did think I'd stop getting bit within a few inches, or even fractions of inches, of the material, but that's not what these things do. They only protect in the areas that are covered, period. Some people would give only one star based on that fact alone, but I gave 'em 3 stars with the intent of acknowledging that I probably could've done a little more research than I did, and known ahead of time what was reasonable to expect. I would prefer that either ExOfficio or Massdrop would say up front what is reasonable to expect, so the lack of a 5 star rating is what it cost y'all for that oversight.