Bugs beware—these socks are coated in permethrin, which short circuits mosquitoes, ticks, and other bugs' nervous systems and kills them before they can bite you. Made of a merino wool/nylon blend, these socks reduce moisture and help regulate temperature to keep your feet cool in the heat and warm in the cold. A reinforced toe and heel help them stand up to your work boots, wear after wear. Product regulations restrict sales to the listed areas.