I like other ideas here but personally I like to use a method that removes loops and tying altogether. You basically end up with two ends as drawstrings where you pull them up to loosen and pull them down and out to tighten. It uses two moving knots and never come undone. Great especially for walking boots or if like me your hands get mechanically slow when cold. Works with gloves in etc. Sorry I can't recall the name of the method though. I'm sure a little googling or YouTube search will find it.