They are reflective for safety for those early morning and autumnal evening walks.
Coordinate the collar with the matching lead and matching harness.

Select the size suitable for your dog

Small – 5/8″ x 10-14″ / 1.6 x 25-35cm
Medium – 3/4″ x 12-18″ / 1.9 x 30-45cm
Large – 1″ x 14-24″ / 2.5 x 35-60cm