The durability of Burlington socks is guaranteed by rigorous testing. Under Martindale abrasion testing, socks must meet an impressive minimum requirement of 20,000 abrasions to meet our quality standards. Why is this relevant to your everyday life? Every path we take; every step we take puts socks under different kinds of stress - whether it's from movement, friction in shoes or washing. Thanks to excellent materials, careful workmanship and the highest standards of durability, they can withstand every step you take.