tubular or flat?

I have these really cool shoes. They are Keens, and are moss green with 6 metallic eyelets. Keens are great because they have rubber toe protectors to take the brunt of my toe bashing/dragging on steps or bumps into stationary objects. But they have tubular laces which are CONSTANTLY coming undone. I think I tie my shoelaces like 15 times a day! Literally! And its not like its one shoe in particular. They even come undone when I double tie. I don't want to get rid of them because i think they make the shoes look cool. Although, flat shoelaces might give me an extra 30mins a day.