I was sucked into the SUMs world because of the story behind the brand. The pledge-per-run is something I loved about the company but to be honest, I wasn’t sure if the socks themselves would follow suit. So I bought a few pairs and man did they prove me wrong… I’m currently training for a 50k Ultra and I’ve worn my SUMs for every run so far. I’m 100’s of miles in and I’ve had no issues with blisters and the padding in the heel is super comfy. I would highly recommend trying them out if you want a decent sock that’s making change in the world every step at a time!