advice on shoewear and suitability of wear of contact lenses in Xian

Hello, i will be travelling there from late NOV onwards, and i am unsure of what type of shoes will be best for the cold weather, if theres any pictures it will be best. i want to avoid boots if possible(as they usually have heels) . In addition, will wearing contact lenses in winter be comfortable(if i use rewetting solutions) especially if im travelling to XA? am worried about the air quality there so would like some advice about it thanks in advance!