I haven't seen this movie yet, but in the trailer, the humans are barefoot all the time. In order to walk more quietly, I guess. There are aliens that hunt by sound.
I haven't seen it but a friend of mine has and yes the people in the move are barefoot all the time and it's so quiet that you can hear people in the theater whisper. But everybody in the movie is barefoot all year around. I never seen a movie that the actors are barefoot all the way through.