The Pet Life 'Aero Mesh' 2-in-1 Dual Sided Comfortable and Breathable Adjustable Mesh Dog Leash and Collar is sold as a 2-piece matching set. The Aero Mesh Collar-Leash offers complete comfort and ventilation throughout with Dual-sided premium Micro-Mesh plush fabrics that are fused together to create exceptional Breathability. Superior in comfort as compared to conventional Nylon or tougher-grade fabrics that place more stress around the neck and hand area, this leash gently cuddles and places less stress around the neck and hand for a more comfortable tug and pull. Features reinforced matched stitching all around with a Stainless steel swivel hook on the leash for multi-directional pull that connects to a Stainless Steel ring on the collar that is meant to withstand high tug pressure. Leash and Collar is 100% Water-resistant and Machine Washable. Available in Multiple Sizes and Colors. Sold together. SIZING DIMENSIONS: In Inches. SMALL: Neck Circumference: 11" - 15.8" Leash Length: 50" MEDIUM: Neck Circumference: 13.4" - 19.8" Leash Length: 50" LARGE: Neck Circumference: 14.9" - 23.2" Leash Length: 50".