glance / umbrella

Sometimes, we feel that is something wrong or is uncomfortable behind of you when we walk down the street in rains so that we clarify safe-check ourselves. And then, we could carry the heavy thing with umbrella in a day. In this case, it is hard to look around of you with them.
This umbrella solve a weak point here. We can drive a car with side or room mirror just glance once. It is like this we can see anything with glancing through it.