Turn Inside Out-Machine Wash-Liquid Fabric Softner is Recommended Features Thorlo legendary padding in the heel and forefoot. Padding is clinically shown to reduce blisters, moisture, pain, and pressure. Exclusive Thor-Lon fibers wick moisture to keep your feet dry. Fibers are chosen for performance and durability resulting in a sock that wears for years. Scuptured fit in the heel, forefoot and, instep provide excellent fit and keep sock from sliding. Low profile toe seam won't rub or irritate feet