Size: XXXS (Chest: 10 - 11.5" Fit Cats). Style: XXXS (Chest: 9.5 - 10.5" 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.