This is SIRIO PF731. The size is 25cm. I usually wear 25.5cm sneakers, so it might be a bit large for the size. I used these for snow mountains. I've used them less than 5 times. They are GORE-TEX, so they are completely waterproof. My feet never got wet or felt cold. I used different insoles, so the original ones are missing. I also have other items for hiking and sports, so please take a look.