+ Living with Dogs Air Light K2, Harness Compatible, Size 4 + Sizes (cm) Size 1: Neck 16-19, Chest 27-32, Length 22 (approx.), Weight 1.5-2.5kg Size 2: Neck 19-23, Chest 32-36, Length 25 (approx.), Weight 2.5-3.5kg Size 3: Neck 23-25, Chest 36-39, Length 29 (approx.), Weight 3.5-5kg Size 4: Neck 25-27, Chest 39-44, Length 34 (approx.), Weight 5-7kg Size 5: Neck 27-31, Chest 44-49, Length 39 (approx.), Weight 7-10kg Size 6: Neck 31-34, Chest 49-53, Length 45 (approx.), Weight 10-13kg + Color Yellow + Opens on the belly (Velcro)