ETC Insoles help to Eliminate The Cause of friction and other orthopedic issues by using innovative design and technology. This is achieved by allowing the foot to have ample, natural movement, which reduces the friction experienced in most shoes. By reducing the friction to almost zero, these insoles also diminish heat and perspiration levels within your shoe to bring comfort and extended wearability. ETC insoles are made of an anti-friction polyester lining and compound PVC foam that is flexible, highly durable, breathable and colorfast. The insoles don’t just wick, store or move moisture, it helps to prevent the build-up of moisture in your shoes or boots. Help prevent painful corns, calluses, ingrown nails, blisters and diminish perspiration by using the ETC insoles. Available in Adult sizes 1 to 14 in men’s sizing. For women’s sizes, we recommend to order two sizes down, if you wear a size 9 in US women’s, your best fit would be a size 7 US men’s. Adjustments can be made to the insole by easily be cutting down to size using a sharp knife and short, frequent strokes.