White Sierra bug-free 3/4 sleeve Henley 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. Formulated to last through 70 wash cycles. Permethrin has been successfully used in the United States as an EPA registered product since 1977, with an excellent safety record. This lightweight, travel-friendly shirt has roll-up sleeves that provide flexibility for changing temperatures. Details: Built-In Insect Shield protection, lightweight material, buttoned placket front, princess seams, 3/4 sleeve length, straight hem. Center back length: 26''. Material: Polyester.