Our Pet Life Harnesses are produced of high quality mesh fabric and feature adjuable stretching straps and high-end buckles. Attach this to any leash and your Pet will be fully secure. Our material is naturally waterproof, windproof, breathable, and lightweight. Velcro Pouch on back is great for any and all belongings. Avaialable in different sizes and colors. Measure in "INCHES" around the Chest and Around the Neck Area: SMALL: NECK 7-9 Inches & CHEST: 11-13 Inches MEDIUM: NECK: 9-11 Inches & CHEST: 14-17 Inches LARGE: NECK: 11-13 Inches & CHEST: 17-19 Inches