Buddy Belt Liners are extra soft leather pads that Velcro onto the BB Harness leg loops. BB Liners offer extra comfort for sensitive dogs or are simply to be used as added comfort until the BB Harness softens and forms itself to your dog. Use BB Liners if you notice irritated skin under your dogs front legs when using a BB Harness. Each size is custom designed to fit its corresponding BB Harness size. They are attached smooth side out. Place the BB Harness color side up, place the BB Liner smooth side down. Start at the center of the BB Harness to connect the Velcro. Smooth into place and ensure the Velcro is properly aligned and firmly attached. Instructional diagrams are shown on the back of the packaging hang tag.