NitePup by Nitevest Rechargeable LED Dog Harness 8 Lighting Modes. Adjustable Straps: 4 Sizes (Small, Medium, Large, XLarge) 360 Degrees of visibility. Sizing Chart: Size Neck Chest S 25-30cm 30-45cm M 31-40cm 40-68cm L 37-56cm 53-99cm XL 48-70cm 66-120cm