Jingyi E-commerce Jingyi E-commerce 20 Pcs Running Bib Clips Fixing System Race Number Buckle Marathon Number Buckle Fasteners/Holders, Random Color

I used these for a couple races and they work great. The 20 piece set is actually 40 pieces if you count male and female parts. There are enough clips to secure 5 bibs in 5 matching sets of colors. My colors were white, blue, red, orange, black. Do not use these for cotton shirts, older shirts or other thicker materials, as they will pierce holes. They are made for thin active wear.UPDATE: Running is awesome!

Product itself works and is secure, but was sent an all black color when it was advertised as multi colored.

As advertised Price fait

These work well. They are really tight, though, and hard to get off, and when I tested them on an old cotton T-shirt they put little holes in it. An old tech fabric shirt fared better. But I just took a bit of fine sandpaper, rolled it up, and ran it inside the hole of the clip to smooth and enlarge it just a bit. That fixed the problem, and now they work great.

I used it for the first time today in a 4-mile run. I wore a heavy hoodie and they stayed on; I can't imagine they'd ever fall off. However, it made a deep indentation on the hoodie. It looks like I used a hole puncher that didn't go all the way through.Maybe it works better on a t-shirt. I'll try that when it is warmer, but for heavy clothing it's not better than safety pins.