The Castelli A/C 18 Sock is a very good hot weather option. The construction is 96% nylon and 4% elastane, which makes for a sock you barely notice once it’s on. 2026-Castelli-AC-18-Sock-cuff.jpg (Image Credit: Farrelly Atkinson)The A/C 18s aren’t the cheapest option out there, but they’re reasonable value for what you get. You could also look at the Pas Normal Studios Solitude Socks which are a couple of quid cheaper and again offer similar performance in the heat. They’re socks, they fit well, they keep your feet cool and do everything you want without any fuss.