"The 2-in-1 design make it can be used as both a pet trailer and a pet stroller. Two 16"" rear wheels and a 360 swivel front wheel provide a smooth ride. And two entrances for maximum convenience getting your pet in and out. The front door features a mesh door for ventilation and a canopy for windproof. The pet bike trailer has a security leash included inside to keep your pet secure during their ride."