Shoes Size Chart US 4.5=EU 34=225mm(bare feet length) US 5.0=EU 35=228mm US 5.5=EU 35.5=231mm US 6.0=EU 36=235mm US 6.5=EU 37=238mm US 7.0=EU 37.5=241mm US 7.5=EU 38=245mm US 8.0=EU 38=248mm US 8.5=EU 39=251mm US 9.0=EU 40=254mm US 9.5=EU 41=257mm US 10.0=EU 42=260mm US 10.5=EU 43=267mm US 12 =EU 44=273mm US 13 =EU 45=275mm US 14 =EU 46=280mm Wearing problems you might encounter 1. Q: Where is the charging port? A: In the shoes inside the mouth! You can get a direct look at the inside of the shoes. 2. Q: Where is the switch? A: Switch is also inside of the shoes, Touch carefully, you will find it. 3. Q: How many colors? A: A total of seven colors, click the switch and you can change color. 4. Q: How to charging? A: We send the USB line, when the lights dimmed, we recommend 3-4 hours charge, Lights illuminate 9-10 hours. Do not turn the light when charging, nor any indicator prompts you to charge, do not worry, entire charge in progress. 5. Q: How to wash ? A: Wipe uppers with a damp cloth,Please don't place shoes directly under the faucet flush.