This is a soft-type Elizabethan collar. I've also attached images from the purchase site, so please use them as a reference for the size. It's a size M. I used it for 4 days on a Pomeranian weighing approximately 3.6kg. It has some cushioning, so my dog could sleep with it on like a pillow. I hope someone who understands that this is a used item will find it useful. Thank you for looking. Please feel free to ask any questions. # Elizabethan collar # Pet supplies # Pet care # Post-operative care