Your dog need to be protected against lost or an accident.
This is the reason why your dog needs a luminous material to capture the attention of other people around him likely to protect him or help him. The best product I have in mind is led collar. It made with nylon. You can use it for all seasons. This Collar For Small dogs/Collar for Medium Dogs/Collar For Large dogs is solid, quick release and reflective. This collar has lights and several sizes (XS/S/M/L/XL).