The PawHut Pet Bike Trailer is a great way to maintain an active lifestyle with your small to large pets. This pet bike trailer can be setup in minutes. To attach the trailer to your bike you simply attach the bike hitch to your rear wheel axle, then slip the arm onto the hitch and attach the pin and safety strap. The mesh zippered screen on the front and back, and the meshed windows on the side allow for maximum air flow for your pet. To protect your pet from the rain, a clear plastic cover is included for the front door.