Bug Free Base Camp Long Sleeve T-Shirt is treated with insect Shield, an odorless invisible insect repellent formulated with permethrin. Insect Shield repels mosquitoes, flies, chiggers, ticks, ants and midges that might carry lyme disease, West Nile and Zika viruses, malaria or other insect-borne diseases. This lightweight, travel-friendly, moisture wicking shirt comes with secure zip pocket at back hip. Crew neckline, straight hem and center back is approximately 28'' long. Material: Polyester.