Extra Strength Insect Repellent Optimum DEET. Powerful insect repellent; repels midges and all flying and biting insects effectively. Extra Strength Insect Repellent is our most powerful formula. This effective formula gives maximum protection from midges and biting insects. Contains the proven, researched, active ingredient DEET, at an optimum level of 20% for powerful, long-lasting protection. Flygard Extra Strength Insect Repellent is the most powerful insect repellent formulated to repel midges and biting insects effectively. Flygard Extra Strength contains DEET at a level of 20% which is an optimum level to ensure it provides instant and long lasting protection. Proven, effective alternative to a natural-based repellent. Maximum protection from midges and biting insects. Contains DEET, at an optimum level of 20%. Powerful, instant and long-lasting protection. Provides instant protection, apply twice daily for maximum protection. Voted Best Value by Horse & Hound. Active ingredients: DEET (diethyl-m-toluamide) an effective chemical developed by the Armed Forces to repel insects in the jungle. This powerful pony/horse insect repellent repels midges, flys and all other flying and biting insects effectively. Contains an optimum level of 20% DEET for a long lasting powerful protection.