Designed for the nocturnal adventures for you and your dog. These Lumitube Illuminated Dog Safety Collars feature multiple seals, making them the only illuminated collars which are WATER and WEATHER proof. Lumitubes are available in 2 lengths(Adjustable up to 20" & Adjustable up to 32") and made with cut-to-fit tubing to enable a perfect fit for any size. Each can be customized at home with adjustable sizing.