I helps with chiggers, but doesn't seem to be completely effective. The most important thing is to tuck your pants into your socks, and make sure there are no holes in your shoes/socks/pants. I got some very itchy chigger bites on my foot even though I used permethrin last year. But when I looked closely at my shoe, there was a little hole near the place I was bitten.
The chiggers were terrible last summer.
The chiggers were terrible last summer.