At this point, I don't know when I received my first pair of smartwool socks. I only know that to this day, I've found no substitute for them. They keep my feet warm in winter, and they keep them from overheating in summer. The added cushion and support make them the most comfortable socks I've ever worn. I've owned 20+ pairs and never had one lose its elasticity; though I have worn through a few of them.10/10 would buy again.