Size: 16.0cm Purchased in February 2025 and used for about 5 months when going to daycare. The strap lights up blue with vibration (I don't know how long it will continue to light up, but it is currently working). The strap is Velcro, and I removed it, washed the shoe part with Utamaro, and stored it. The strap cannot be washed with water, so I wiped it with a wet towel. I used insoles for the first 3 months or so. (I've removed them now) I didn't play in the sandbox until it was muddy, and I used them in a clean condition, so I didn't need to wash them until they were outgrown. As shown in photo 6, there is stickiness on the name sticker area.