I run with these lights around 3x per week, sometimes upwards of 15 - 20 miles per run. They are great in helping to see tree roots, sidewalk cracks, etc. that are trip hazards. Knock on wood, no trips/falls since having these lights. Both of my running partners have now purchased the lights too. They are lightweight and very easy to run with. They also increase our visibility while wearing them in the dark. We have had cars and cyclists stop and thank us for wearing them.