Breathable & TransparentThe sides of this small animal playpen composes of mesh and cloths, good ventilation .You can watch your pets all the time,and enough space for playing and keeping active in playpen. EASY TO CLEANThis small animals playpen has the waterproof bottom which makes it easy to wipe clean after playing. LIGHTWEIGHT & PORTABLEThis playpen dog is light weight and even a little heavier than an apple. So its very portable after folded into the little case and can be taken to anywhere very easily. PERFECT SIZEWhen this pop up playpen set up for use, it takes up very little room, but offers a lot of space for pets to run around. EASY TO USEThis hamster playpen is easy to set up - as long as taking it from the little case, it will auto open up for direct use. It also can be folded easily into the case for convenient storage.