The Pet Life 'Aero Mesh' 360 Degree Dual-Sided Adjustable Mesh Dog Collar offers complete comfort and ventilation. This collar features 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 lay around the neck, the Aero-Mesh collar gently cuddles and places less stress around the neck area. Features an Ultra-Sturdy Buckle Clip with a protective mesh layer preventing hairs from getting caught or pulling and a reinforced Stainless steel leash connecting ring meant to withstand high tug pressure. Collar is 100% Water-resistant and Machine Washable. Available in Multiple Sizes and Colors, Matching Leash or Lead Sold Separately. SIZING DIMENSIONS: In Inches. SMALL: Neck Circumference: 11" - 15.8" MEDIUM: Neck Circumference: 13.4" - 19.8" LARGE: Neck Circumference: 14.9" - 23.2"