Picaradin comes as close as I've seen. The only US brand I've seen for it is Cutter Advanced. I tried it last year, and I'm using it this year. No damage to nylon that I can detect- I've got some nylon scraps in a mason jar, along with a heavy blast of picardin. Hasn't weakened in a year, I'm going to call it good.

What it doesn't to much with is ticks, but I keep a peice of flea/tick collar in the laces of my boots.