Repellents play an integral part in your personal protection strategy. Repellents containing DEET are not sufficient to protect against tick bites. DEET only repels ticks to areas where they could bite and even that little protection does not last long. PERMETHRIN kills ticks on contact. Clothing only repellents that contain Permethrin are very effective and provide long-lasting protection. The best protection you can achieve is by using a repellent that contains Permethrin on your clothes and one that contains DEET for your skin.