Turn Inside Out-Machine Wash-Liquid Fabric Softner is Recommended Features Thorlo padding in the heel, forefoot, and on top of the arch. 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. Anatomical design consistent with natural contours of foot helps promote a better fit. No-Rub toe seam will not irritate your feet.