Canadian Shield Insect Repellent-230G 30% DEET Aerosol Fights against: Mosquitoes Biting Flies Gnats Ticks Chiggers Deer Files Black Flies Fleas AND MORE! At Canadian Shield Insect Repellent, we have a long and rich history with the Canadian Outdoor Industry. We have had real-life experiences in the great Canadian Outdoors and believe that everyone should have the dom to explore the beauty we have seen. However, we k that with spending time outdoors comes mosquitoes. We ourselves have been through instances of being swarmed by black flies in the great North. Whether it is fishing, hunting, or even hiking – we have been there. That is why, as a 100% Canadian Owned and Operated Company, it is our mission to protect you from mosquitoes so you can truly appreciate the beauty of Canada.