Protect your feet against Ticks, Mosquitoes, Flies, Chiggers, Ants, and other pesky little critters! The active ingredient is Eulan Spa 01 that keeps bugs scattering. 50+ washings before it will wear off. Turned Welt Top for Strength and Support with Spandex throughout for a self-adjusting comfortable fit. Machine wash cold & tumble dry low. Large fits Men's 10-13.