“If you did not know that the shirt was treated with insect repellent, you could not tell by the feel or the smell, as both are "normal". I wore it traveling through Tanzania, Africa while on safari and while doing yardwork in northern Floridia in the summer and was not the least bothered by mosquitoes or tsetse flies. It is soft, comfortable, and layered well below other shirts, keeping me warm but also being breathable. It runs a little small in size, but overall an excellent product that I would recommend.”