Thanks to the combination of icardine-based active ingredients and the extra strong smell, the dermatologically tested Effol Horse-Fly-Blocker + is the extra strong and highly effective horse fly repellent spray. The ready-to-spray formula with a long-lasting effect was developed in collaboration with the Swiss Tropical Institute to protect against bites from horse flies, ticks, midges and flies and has preventive effects against summer eczema.Riders in over 50 countries place their confidence in the effective Effol Horse-Fly-Blocker.