Mim safe Variocage is the only crash test certified and approved dog cage on the market and the most rigorously tested and proven dog transport cage in the world. MIM safe Variocage is designed and constructed to deliver the highest level of safety. The MIM safe Variocage is the only dog cage on the market that is proven to best withstand impacts experienced during all types of collisions. Protect yourself, your family and your pet from the devastating effects of a collision, where lesser restraints may allow your dog to become a deadly projectile within the vehicle. Reduce the risks in a serious rear-end collision, where the Variocage mimics the function of the vehicles crumple-zones, greatly diminishing the possible injuries to your dog and passengers. Don't just take our word for it. The MIM safe Variocage has been certified to meet or exceed stringent crash test safety standards established by the united nations economic commission for Europe. The Variocage comes in 4 adjustable models and 14 sizes; there is sure to be one that fits your vehicle and the needs of your dog. Variocage includes a built-in key lock for security. In the event of an accident, a trapped dog can be released via the unique escape hatch. All models are equipped with a rubber carpet for comfort, quiet, and ease of cleaning. Adjustable, telescoping length from 36.22 Inches to 45.66 Inches.