These are the well-known Mad Rock orange climbing shoes, used for bouldering. For bouldering trainers, it's okay if they're a bit tight and even a little painful at first. This is because you wear them with your toes curled. You'll get used to it. It seems that's how it should be to grip the holds on the wall with your feet. So, they will probably feel tighter than your regular shoe size of 25.5 cm. The actual size, roughly, looked like 24.5 cm from the outside.