Now we have made the WaggWalker® even better! As of October 28, 2016, you will receive a FREE set of the Sherpa Comfort Covers with the purchase of a new WaggWalker®. This is the Sherpa Comfort Cover. A dog’s underarm area is especially sensitive so we have created these covers specifically for your dog’s comfort. This soft material is gentle to the touch and was designed to help to avoid any potential rubbing or chaffing of your dog’s skin.