What's the difference between midweight and lightweight hiking socks?

Midweight socks have more cushion underfoot and are warmer — better for boots, cold weather, and rocky trails. Lightweight socks dry faster, breathe better in summer, and pair well with low-cut trail runners. Reviewers in r/Ultralight strongly prefer lightweight for thru-hiking; cold-weather and work-boot users on r/WorkBoots prefer midweight or full cushion.