Doggles brings you Insect Shield technology. Full length T Shirts protect your pet naturally. Repels mosquitoes, ticks, ants, flies, chiggers, and midges (no-see-ums). Insect Shield protects against a variety of insects that can carry dangerous diseases. The EPA registered technology is long-lasting, effective, and convenient. Insect Shield uses a man-made version of a natural repellent found in certain types of chrysanthemum flowers.