@hongminhee Here in Quebec, about one third of the year or more there is snow outside. So, we always take our boots off at the door so we don't track slush around the house. In your own home, you have slippers or house shoes near the door; some hosts provide extras for guests. Sometimes, visitors bring their own. Most households continue this requirement even when it's warm outside, but some will soften it, especially for visitors. In our house, we go shoes-off all year round.