G B ProCollar Premium Protection Collar has an inflatable inner bladder made of a plastic vinyl that is inflated through a two-way air valve much like a beach ball. Once inflated, the size and thickness of the ProCollar function as a soft deterrent. The inner bladder is protected by a pliable plastic outer jacket lined with a durable canvas material to resist bites and scratches. While wearing the ProCollar, pets are able to eat, sleep and play at ease while staying protected. The ProCollar is held in place by inserting the pet's everyday collar through the ProCollar's three inner rings. The VELCRO brand strap should be placed at the back of the neck and then adjusted for a perfect fit. The ProCollar is a great alternative to the traditional E-Collar. VELCRO is a registered trademark of Velcro Industries B.V.