I have a couple extras that didn't work out for my kitty. If you're US based, I could mail them to you. Once I get off work I'll add the Amazon/Chewy links to what they are.

Okay, the amazon one is in a M. It was way too large for Ludacris who is a 10 lb Bengal. https://www.amazon.com/gp/product/B0828CX46P/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1

The Chewy one is in a small, and is waaaay too small. I can't even get the straps to clip. I don't believe I have the packing for this one still. https://www.chewy.com/petsafe-come-me-kitty-nylon-cat/dp/52091

The Amazon one was still helpful since I could get him comfortable with sticking his head through the hole.