I bought this watch because the rubber band is adjustable. I have been using it for 4-5 months, and want to write a review (for those who can't read Japanese reviews like me) It fits the wrist very well. And it looks fashionable too. Very suitable for those who like the sporty style. About the water resistance function: I don't take it off when I wash the dishes or take a bath, and it still works well. So everything is OK.