Doesn't hijab makes ladies uncomfortable?

I don't have anything against any religion. I know wearing of hijabs is a thing for Muslims and it's meant for their ladies to wear at all times covering their hair. But I can't help it thinking how uncomfortable that's going to be even wearing it when the weather is extremely hot.

Doesn't hijab makes ladies uncomfortable?

It is all about religion and should be respected. People that wear it should be let to be because it is something that they began wearing right from when they were very little.