The Sorbothane Double Strike Insole uses a comfort contour and heel cup in the heel forefoot area, with added shock absorption in the forefoot area, for total impact cushioning as you move.__ Sorbothane's unique viscoelastic material mimics the characteristics of human flesh and absorbs 94.7% of vibrations on impact.__ An abrasion-resistant top sheet enhances durability whilst wicking away moisture from skin, managing any odour for optimal hygiene and comfort.__ It's designed to replace an existing insole, letting you create the perfect fit by allowing you to trim it down to size in order to match your footwear.