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Extra THOR·LON® in heel and ball provides density in the padding to protect against shear and impact forces. THOR·LON and spandex provide more stretch, better fit and help to keep the sock in place. Flat knit at instep and lightweight padding in the arch improves fit. White THOR·LON is used in toe area to prevent sensitive skin irritation. Fiber Contents: 86% Exclusive THOR·LON® Acrylic, 10% Stretch nylon, 4% Spandex