M,Means The Standard Width It is made of high quality materials,Soft hand feeling, no any harm to your baby Please allow 1-3mm error due to manual measurement. Insole Length=Foot Length+0.8cm Package content:1 pair baby shoes(Not Including shoes box) Due to light or display setting,please understand that there may be color difference. Shoe upper material: Cotton Fabric If you are not sure which size or other problems,please contact us to make sure you choose correct size. Gender:Girls/Boys Sole material:Rubber Style:Casual,Fashion,Party and Charming design available,Make your baby more Fashion :Casual