1. Let's measure and buy the correct size: Neck: Measure around your dog's neck, leaving room for two fingers. Bust: The most important size; measure your dog's chest at the widest point. Add 2 inches for comfort. If your pet is between the two sizes, we recommend ordering the larger of the two. 2. Give your dog a warm winter: Waterproof surface, soft warm fleece padding and thick cotton inner layer keep your pet warm in winter. Even in heavy snow, in cold winds, it still keeps your dog warm and comfortable. Lightweight suit for everyday wear. 3. Keep your dog safe in the dark: Large areas of reflective elements will stand out in the dark, keeping your dog safe at night. 4. Belly buckle design, easy to put on and take off. Bottom buttons can be adjusted to better suit your dog. 5.The belly is designed to not interfere with your dog's urination. Machine washable.