The Italain Greyhound Windblock Fleece Bodysuit is great for the harsh winter weather. It is insulated, plus windproof and waterproof, and 3 layers thick. The outer fleece is a velvety, water repellent fleece, that fights off the elements as well as stains. The textured inner fleece adds to the insulation properties. In between is a polyurethene layer blocking wind and snow. Windblock Fleece will keep your dog warm down to the 20s, and should never be worn inside.