Adding a darkening, yet breathable, crate cover can help to keep sunlight out of your dog's crate. All of our crate cover patterns will block sunlight, but if this is a main concern for you we suggest one of our darker colors. On every molly mutt crate cover the front and right-side flaps roll down for those times when your dog needs a good night's sleep. The same sides also roll up so you can position your crate however you like in your home. non-toxic and free from harmful chemicals breathable 100% cotton canvas material front and side panels roll up snaps keep the panels open or closed sized for all major crate brands