Just the right size
I tend to think of my window sills as fairly wide, but in searching for a bed to put on one of them, I struggled to find something that would actually fit without requiring screws or other fixings. (I live in a council bungalow so "permanent" stuff is usually a no-no.) This mat is the same width as my window sill and non-slip enough that it doesn't move around as a plain old cushion would (though it did start out in the centre of the window and slowly get pushed all the way to the left when KitKat walked over and around it. I do think it needs to butt against one wall to make sure it's truly non-slip). KitKat kips on it about half of her window time, so it's not perfect. I wanted it to keep her warmer when she's watching birds, but she'd rather sit on the other end of the sill while she does that, and only uses the mat when she's having a nap (facing me so I know when she's actually sleeping on it). Still, she seems comfy on it, and she can stretch full length on it if she wants. It's definitely worth £3.99, but I'm not sure it would be worth much more than that given how little of her day she actually spends on it.