There’s a short one, a standard one, and a long one. You must have the short one, because the standard is deffo on the longer side.
I’ve just picked up my first few pairs of Rapha socks too, and I think they’re great. The merino ones are so comfortable that I can’t even feel them after a few minutes, and the non-merino ones aren’t far behind at all. Definitely my go-to choice for socks now (well, during the sales).
I also really like some of POC’s socks, and DHB do great pair of winter socks.
I have a couple of pairs of extra thick merino socks from Kalf, and those are fantastic when it’s reeeeally cold.