Ever since my trip to Africa I have become a firm believer in Permethrin. I'll spray it onto all of my clothes that I plan on wearing up in the hills where there is high grass, or overhanging trees or brush. It is the real deal in keeping ticks, and no see ums off of you.
While I was hunting in Africa we decided to sit down and do some glassing. I sat down and didn't realize that I had kicked over a rock with a ant bed under it. When I looked down my boots were covered with the little biting buggers but they stopped when they got to my pant cuff and socks that had been sprayed. Also when we were hunting impala the outfitter told us that there were ticks all over in the high grass and brush that we would be in. I sprayed my arms, neck, and face down with bug repellent but my clothing was treated with the Permethrin. When we got back to the lodge I didn't have a single bug on me. Another hunter went out into the same location the next day and he came back covered in ticks the size of a pepper grain along with a few other blood suckers. All he used was bug repellent and hadn't sprayed down his clothing. The ticks just found a opening and went for the blood supply. He came down with a mild case of tick fever that he had for the rest of the 2 week trip.