Just get something that is close to 100% deet. I send all my hunting clothing I use for Africa to insectshield for them to commercially apply the permethrin to. It's super easy and relatively inexpensive. The Sawyers stuff works great too but it doesn't last long through washes, while the commercially applied stuff can last a very long time. I've used both options over the years and I have yet to get any tick bites on me while hunting Africa. I treat my socks, pants, shirts and jackets and I only wear pants. No shorts so my legs don't get torn apart.