If you are hiking Arctic Circle Trail in the summer season, then I would recommend to use head net. If you are used to mosquitos, then wait till you meet the small irritating flies. These flies have only one mission: to drive you crazy if you don’t have a head net 🙂
As many you will take breaks on hilltops in the breeze, and enjoy the great view of the arctic tundra.
Try to buy heat net and mosquito repellent at your own home before leaving to Greenland. These can be sold out up here in the “mosquito” country.0