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Durable and comfortable men's merino socks are infused with safe and effective insect protection that repels annoying biting (and possibly disease-transmitting) insects — before they crawl up your legs. No Fly Zone® Insect Repellent Technology incorporates permethrin as a contact repellent to protect against mosquitoes, ticks, ants, chiggers, fleas and midges. Permethrin is similar to the naturally occurring pyrethrum insect repellent found in certain daisies. Merino wool wicks moisture and regulates temperature so feet stay comfortable. The seamless toe closure eliminates bulk and helps reduce friction blisters, and the compression band creates a firm fit, providing all day support to help fight foot fatigue.