DEET does not stop noseeums, but the oil will. They get stuck in the oil and cannot bite. That''s why Avon''s Skin-So-Soft works so well for noseeums. It''s healthier than DEET, but mosquitos, etc. don''t care about the oil, and you have to be well greased for it to really work. Noseeums are a problem when the light and wind are low, like other biters. In areas that are mangrove/swamp like, you will have big problems. Stay away from those anchorages if possible.