Step-In Reflective Dog Harnesses help to Enhance Your Walking Experience! EcoBark's Eco-Friendly Dog Harness was created to uniquely fit those odd shaped dogs, it's made from ROSH Tested, not toxic ultra-padded mesh and nature friendly strappings created from recycled water bottles. The Rapid Fastener Harness is a gentle soft vest harness that is available in 6 different colors and 5 sizes Easy Fastener technology hugs those 'odd' shaped dogs, allowing you to give your dog the perfect non slip fit! Ultra-Soft and Highly Durable Eco-Friendly high-quality Straps Made from Recycled Water Bottles ROSH Tested, Non-Toxic, Light-Weight Polyester Ultra Padded Mesh Comfort Webbing. Innovative No-Choke Design Protects Pet's Fragile Trachea and Throat with Extra Plush Piping Around the Neck Opening. Great for Walking, Running and Hiking. Breathable for all Outdoor Activities, Hugs the dog with a Flexible Air-Mesh which Maintains your Dog's Natural Movements in all weather conditions Adjustable Belt, Double Stitched around a Reinforced Anchor Hook, and Non-Breakaway Quick Release Clasps. The Rapid Fastener Harness Measurements: Important! Rapid Fastener Harnesses are a different and a more innovative design, so please do not base sizing off of other companies sizing. Animals come in all shapes and sizes. Therefore, please measure using a standard measure tape to get the best fit. Sizes below can be different depending on dog breed XX-Small: 3.5-5 lbs Base of Neck- 7.25 in Chest Girth: 9.25-10.25 in X-Small: 6-8 lbs Base of Neck-11.5 in Chest Girth: 11.5-12 in Small: 9-12 lbs Base of Neck- 12.5 in Chest Girth: 13.75-15.5 in Medium: 13-17 lbs Base of Neck- 15.5 in Chest Girth: 17.0-18.0 in Large: 18-27 lbs Base of Neck- 18.5 in Chest Girth:22.5-23.25. We incorporate Eco-Friendly Materials to help reduce the environmental footprint on the planet. We want to ensure a better future for our next generation of pet lovers and furry friends.