I didn't have high hopes for this item simply because after trying a few items alike, they didn't seem to pan out.  But i must say i was pleasantly surprised.  It's durable and very comfortable for both my cats.  I do have to buy another one though because my cats like to lie down on them. Once my other windows are done, I will buy 2 more.  THANK YOU for helping me find the right item that can hold my cats' weight!