we get a lot in our garden (borders the woods)
I’ve made my own acaricide – citronella oil, mixed with a cheap moisturiser. Lathered on. Stops them coming near you. If you’re really going for it, add some cedar oil (link for study), or rose geranium
they do work. You might smell a bit funny…
the other thing – for my gardening clothes – is to get some 10% permethrin (cheaper from america, but amazon.fr sell some pre-made sprays). Dilute it, soak the clothes for an hour or so, and then drip dry. Clothes then have the ability to kill anything that does try and get on, which stops the crawling up the shorts malarky (and you can use the remaining liquid as a spray). It lasts for a few washes, and doesn’t degrade in sunlight.
The natural equivalent (pyrethrum) breaks down in UV light…so won’t last, but you could wash in a mixture of it after a ride. Perfectly safe for humans.