The repel 100 uses a 98.1-percent deet formula to provide complete protection from mosquitoes, ticks, gnats, chiggers, no-see-ums, and biting flies. Use in areas of high infestation or prolonged periods of outdoor activity for up to 10-hour of protection. The new 4-ounce pump is large enough for high use consumers, yet small enough for easy portability. Product Features Ideal for extreme environments. Repels mosquitoes, ticks, chiggers and biting flies up to 10-hour. Larger size for high consumption consumer, yet small enough to be portable. 98.11-Percent DEET is the most concentrated formula available.