Sometimes, it's the little things that help to create success. Champion UCLA basketball coach John Wooden famously spent the first basketball practice each year teaching players to put on their socks properly. After all, it only takes one wrinkle in your sock to cause a blister and distract a player from making the game-winning shot. It's like the famous "For want of a nail...the kingdom was lost" proverb: little things can make a huge difference.
I'm going to assume, if you're a trailrunner, that you already know how to put on your socks. But here's a question: do you know how to lace up your shoes?
I've been tinkering for years with different lacing patterns, trying to achieve the very best fit possible. I like a lot of room in the toebox (so my toes won't go numb) coupled with some kind of anchoring mechanism to keep my foot from sliding forward on those steep downhills (I've lost plenty of toenails, but each time it happens, it still hurts!)
Finally, I think my years of tinkering and observation have resulted in a truly excellent lacing regimen -- one that allows for a roomy toebox but keeps the foot from sliding forward. On the off chance that it helps you, too, here goes...
Once you put your foot in and tighten everything up, the fact that you threaded the top laces through those loops is what helps everything stay locked nicely into place, without loosening up as you run downhill.
Everyone's feet are different, so I can't guarantee that this method will work for you. Over the past several months, though, I've been very happy with it.
Happy running, and see you on the trail!