3 Outfits In 1!!! The 3 in 1 All Terrain Jacket provides versatility and quality that gives the most bang for your buck! Your pooch is covered for three seasons with one piece of dog clothing. The blue fleece lining makes a great sweater for autumn, and then when winter comes, the lining and nylon shell together make a fantastic and cozy coat. When spring arrives, the outer shell can be worn by itself as a rain jacket or a windbreaker.