My dog is 35cm from neck to base of tail so I bought 2XS and it's like a second skin, perfect fit. The material is soft, stretchy jersey and washes well. It has a lighter blue gusset so any exudate is easily seen, or you can use sanitary pads. Poppers at the back make it easy for her to toilet, there is a tab on the inside which holds it in place when rolled. The leaflet has lots of useful information and worth taking the time to read. Our vet said she might lick the material and make the wound wet, we haven't noticed this but keep checking. I really can't find anything negative to say about this product, great design.
Berith Henry