Coat is waterproof & personalized with his name on the nape of his neck & lined with 2 layers of fleece for warmth. Coat also has leg straps to keep the back of the coat over his bum. I resized this from a pattern for a small toy dog. Made it a couple of years ago because we were traveling in the late fall early winter in a pick-up truck. Dogs teeth were chattering before that. For anyone that wants the pattern, http://www.sewing.circleofcrafters.com/freepetvestpattern.html is where I got it.