ADJUSTABLE FOR SMALL and MEDIUM SIZES: Fully adjustable Velcro for snug and comfortable fit and easy size adjustment. For your dog’s best fit, please refer to our size chart for the best measurement. CUSTOM FIT & NO CHOKE: Elastic fabric eliminates pressure and provides ultra comfort around neck area. High dense air mesh provides ultra comfort on dog’s chest. Cross-stitched nylon straps for optimal tension distribution and protection against neck injuries. Constructed with breathable high dense mesh and allows efficient air flow throughout the chest area. Solid and vibrant colors are easy to see. Perfect fit for your small and medium sized dogs. BREATHABLE MATERIAL: Reflective and vibrant colors are easy to see at all times. Air mesh is breathable and lightweight that keeps your pet cool and ventilated with super soft comfort on your dog's skin and fur. DURABLE & HIGH QUALITY MATERIALS: Fray resistant and 100% high quality dense 3mm thick air mesh shell. Durable fully welded two D-Ring for quick and easy leash attachment. Durable plastic side release buckle that quickly clicks shut and stays shut to ensure extra security. RETURN POLICY: If you are not completely satisfied with your purchase, you can return for a refund or exchange unworn items within 14 days.