Keep Lyme-diseased and West Nile virus-carrying ticks and mosquitoes off your back while enjoying the outdoors. Powerful spray repels black flies, ticks, chiggers, mosquitoes, deer flies and other biting insects. This 98% pure DEET formula discourages pesky insects from taking a bite for up to 10 hours. 1.25-oz. bottle fits easily inside your pack. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Repellent Sprays.