Smidge stopped me getting any ticks last time I was walking and wild camping in sheep country - except when I didn't apply it.
If I didn't get any when I applied it and I did get a couple when I didn't apply it, that suggests to me it is effective.
The Pocket one is a spray, it's small, flat and light, and it cost me about a fiver.
Sorry to keep plugging the product as if I have a connection with the maker, but I certainly do not. I just think it is the answer to a problem.