First of all, nanospikes are great. I use them for both icy run commutes to work in Boston (before the sidewalks are treated) and winter trail running. I don't notice the on my feet and I am able to run normally w/o stopping over icy patches etc. because the traction is great. They also help prevent the risk of injury since I am not constantly changing my running form to avoid slipping. Secondly, I will forever be kahtoola loyal due to their excellent costumer service. I bought my nanospikes about 2 years ago and was upset when my dog chewed through one of them. I emailed them asking if I could pay for a repair (given that obviously a warranty doesn't cover for pets being jerks!) and they said they could send me an old demo that they had lying around in the office. Not 4 days later, my new-to-me (but used) replacement nano-spike arrived. I could not be more impressed. Great company with great products and great customer service.