Plastic — Plastic types of dog crates are ideal for those that live in colder climates because it forms just enough barrier between outside air and the inside of the cage. (mypetneedsthat.com)
Dealing with a variety of plastics types all in one recycling plant seems too good to be true. (treehugger.com)
Love that these also do nt make any noise when moving around like some other plastic type covers. (well.ca)