I have 12 pairs of the same lightweight Darn Tough socks that are perfect for year round use (I don't live in snow). I've had them for ~10 years now and when a given sock gets a hole in the bottom, I put them in a pile and wait until I have 4 then send them back for two new pairs of socks. They were initially expensive, but after each being replaced a couple times, they are dirt cheap (even when factoring in one-way shipping). Thankfully, they have kept the exact same style all these years. Fingers crossed that they stay in business and that 80 year old me will have saved a lot of money by not buying socks.