The size is technically 25.5cm, but it's quite large and roomy, so even those who usually wear 26.5cm-27cm might need to adjust with socks or insoles. It's top-tier for adding height. I tried them on once, but they didn't fit me, so I immediately took them off, put them back in the box, and haven't had a chance to use them since, which is why I'm selling them. If you pair them with wide pants, they won't be visible at all. They were stored in a smoke-free, pet-free environment with consistent humidity and temperature control year-round, away from direct sunlight.