What's my size?

Dear Peony running socks come in S/M and M/L. Two sizes, not seven. A good sock stretches to cover a range, and splitting it finer mostly sells you the wrong box.

Between the two? Size down. These stretch, and a sock that sits slightly snug stays put over sixteen miles. A loose one slides into your shoe and takes the ruffle with it.

Mid-crew sits just above the ankle bone - roughly four inches up the leg. High enough to clear a shoe collar so nothing rubs, low enough that it doesn't read as a tube sock. The ruffle sits at the top of that, which is where you can see it.

Stand on a piece of paper, mark the back of your heel and the tip of your longest toe, and measure between the marks. Do it late in the day - feet swell, and the sock has to fit the foot you run on, not the one you wake up with.

These are cut for a woman's foot: a narrower heel and a shorter arch band than a unisex sock of the same length. If you have worn unisex socks that bunch at the heel, that is the difference you will notice first.