They are waterproof and lightweight. If you are looking for a waterproof collar for swimming, hunting etc, I would recommend you go with this collar. They come in all colors and have adjustment holes about every 1/4 inch for a perfect fit. Also the SCIERIAL collars have much nicer hardware. This is a great collar for when the dog is swimming. It is very durable and very flexible. It can be easily washed off and so far the plastic coating hasn't cracked!