Size measurement as following. Please measure your heel to toe length and choose size according to the following size measurement.
US Size Description
6.5" foot, suggest size: 10M US Toddler
6.625" foot, suggest size: 10.5M US Little Kid
6.75" foot, suggest size: 11M US Little Kid
7" foot, suggest size: 11.5M US Little Kid
7.125" foot, suggest size: 12M US Little Kid
7.25" foot, suggest size: 12.5M US Little Kid
7.5" foot, suggest size: 13M US Little Kid
7.625" foot, suggest size: 13.5M US Little Kid
7.75" foot, suggest size: 1M US Little Kid
8" foot, suggest size: 1.5M US Little Kid
8.125" foot, suggest size: 2M US Little Kid
8.25" foot, suggest size: 2.5M US Little Kid
8.5" foot, suggest size: 3M US Little Kid
8.625" foot, suggest size: 3.5M US Big Kid
8.75" foot, suggest size: 4M US Big Kid
9" foot, suggest size: 4.5M US Big Kid
9.125" foot, suggest size: 5M US Big Kid
9.25" foot, suggest size: 5.5M US Big Kid
9.5" foot, suggest size: 6M US Big Kid

Model Number: 161219XZ0631C60Z600

• Synthetic leather and cloth combination of network, breathable, wear-resistant rubber soles
• Hook-and-loop straps with fixed elastic lacing for easy on/off and adjustability.
• SWITCH INSTRUCTION: Hidden switch by the charging port. Press it to switch on.It starts with steady Blue light.With each press,it changes to another light mode.Press the switch for 9 times to turn the light off.
• CHARGE INSTRUCTION: Easy charge like your cell phone with the attached USB charging cable.Switch on the shoes when received and light up until all power gone.Then charge both shoes for 3 hours.
• LIGHT MODES:1.light on from red(steady)-2.green(st')-3.blue(st')-4.yellow(st')-5.skyblue(st')-6.purple(st')-7.white(st')-8.white(twinkle)-9.slow auto-change mode-10.fast auto-change mode-11.twinkle+auto-change mode-12.light off

Synthetic leather and cloth combination of network, breathable, wear-resistant rubber soles