If you are kayak-camping on Scotland's west coast during the summer, these are the enemy.
Highland midges exist to remind man of his place in the food chain. I one hour, a swam can inflict three thousand bites on an unprotected arm.
Now a new type of repellent claims to act as an invisibility cloak, masking we humans so the midges can't find us. The BBC is writing about it as is The Scotsman.
We're going to be using these Anti-Midge patches during the summer which seem to work for us in a similar way.