These are saving me so much grief. I wear black, navy, brown and grey socks all the time. Each color now has its own color lock. The black and navy were so hard to tell apart and since I have so many socks, sorting took too long to match them. This has taken the stress out of post-dryer laundry for me. I love that one lock holds a pair. Not once has a sock become disengaged from the lock either.