Tried and tested, stable and safe: Muuwmi's adjustable children's roller skates provide years of skating experience as they grow with the child. The impact-resistant PP, high-impact-resistant frame and high-rebound molded PU wheels ensure comfortable and fast rolling. The wheels measure 64 x 22mm and have ABEC 5 ball bearings. The size can be easily adjusted with the push of a button. The breathable, soft boot with a ventilation system provides excellent comfort, while the quick-lacing system and Power Strap allow easy getting on and off, so the child does not need help to get on.