The Dog Helios ® 'Scorpion' Sporty High-Performance Free-Range Dog Harness features Dual-Layered and Air-Cushioned Micro-Mesh for Complete Comfort and Breathability, that is also Permeable and High-Performing. The Inner Belly and Upper-Chest is secured with Comfortable Polar Fleece padding that's spread apart creating a Free-Range of Mobility while placing less pressure along the chest area and friction protection. The adjustable Quick-Connecting buckles are connected to Dual-Stitched bar tackle Nylon straps that are heavy-duty for added safety and durability. Features reflective-tubed stitching for added night safety and visibility with an above-top safety-grab handle that's also great for training, with a Stainless Steel leash connecting D-ring along the top. Available in Multiple Sizes and Colors. Sizing Guide (INCHES) HARNESS DIMENSIONS: SMALL: CHEST GIRTH: 17.71" - 20.1 NECK CIRCUMFERENCE: 14.17" - 17.32" MEDIUM: CHEST GIRTH: 20.5" - 23.6" NECK CIRCUMFERENCE: 15.75" - 19.7" LARGE: CHEST GIRTH: 24.1" - 30.3" NECK CIRCUMFERENCE: 19.68" - 24.8"