3in1 skates + rollers + roller skates with size adjustment, SMJ Sport BS-616TP Properties: Multifunctional skate-water-rollers with the possibility of adjusting the size of the shoe. An adjustable shell allows a growing child to use for several seasons – in the winter months as skates, in the rest of the year as a roll or roller skates. The plastic construction of a shoe with a movable collar provides adequate leg stiffness, safety and comfort while driving. A soft and comfortable sock inside heats and provides adequate air supply. Special beggar in the top of the shoe allowing the air supply. Skate-roller-rollers are comfortable and quick to put on. The buckles have an Auto Lock system, which prevents the fastenings from unplugging or loosening during use. Roller skid made of aluminum. PU wheels (so-called rubber) quiet, soft, embedded on very good ABEC-5 bearings. Brake on the right roll. The size adjustment is easy to use, and at the same time safe (it is not possible to move automatically). To change the size, press the button under the heel and, holding the front of the shoe, spread to the right distance to the audible click. When adjusting the size, loosening, remove the Velcro and buckle. Converting a skate with a roll or roller is only about unscrewing two fastening screws, inserting a selected skid and tightening the screws back. The box contains the Allen keys needed for this activity and the user manual in Polish. Specification: wheels: roller skates: PU, 54×32 mm / rolls: PU, 64×22 mm (27-30, 31-34), 70×24 mm (35-38, 39-42) Bearing: ABEC-5 SKORUPA Semi-Soft skid skate: aluminum skip skid: stainless steel brake: TPR fastening system: cushion + tpr Lock + Velcro