X-LOCK technology provides advanced arch and plantar fascia support and locks the foot in place within the sock to reduce blistering. 2.5mm light cushioning designed to cover all the bases for most activities and help hide irregularities in footwear that could cause discomfort. Engineered to conform to left and right structure of the foot for better fit. Seamless wide toe box eliminates a key irritation point and promotes natural toe splay improving balance, alignment and comfort Machine washable. 88% Nylon, 12% Lycra dualFX elastomultiester.