Size: XXS (Chest: 11.5 - 13" Fit Cats). Style: XXS (Chest: 10.5 - 13" Fit Cats). STEP IN, CLIP & GO! Step into your next walk in this simple and easy-to-wear vest harness. REFLECTIVE BANDS: Two reflective bands on the sides of this harness enhance your pets visibility for those early morning and late evening strolls.