The Dog Helios 'Tidal Guard' Multi-Point Strategically-Stitched Reflective Pet Dog Life Jacket Vest is a full body system geared with ultimate flotation protection with Mobility and Safety in mind. Features a specially treated 600D Oxford Nylon Exo-Shell that Durable, Tear Resistant and Reflectively Stitched for added night emergency safety and visibility. This Life Vest features a fused full flotation body with Triple Dual-sided extended buoyancy points for a full free range of motion with added flotation protection. Improved mobility helps prevent freezing or over-working of muscles during swimming activities. This Life Jacket features an above-top durable rescue handle for easy rescue in water by boat hook or by hand grab and is cross stitched for added Durability. Features a Dual harness ring along the back-side and 3 Durable thicker-grade Adjustable Nylon buckle straps that secure around the body with underneath Ultra-Thick and Durable Velcro enclosures that Velcro underneath the below-the-belly Nylon Straps and below the Neck straps for added security. Get Outdoors with Dog Helios! Available in Multiple Sizes and Colors. SIZING MEASUREMENTS: SMALL: Body: 8.7 Chest: 18.1 - 21.6 Neck: 16.9 - 19.7 MEDIUM: Body: 9.8 Chest: 20.5 - 24.8 Neck: 19.3 - 23.2 LARGE: Body: 11.8 Chest: 23.2 - 28.3 Neck: 23.2 - 27.6.