Crew socks

The length everything else is measured against.

A crew sock finishes roughly a hand's width above the ankle bone, partway up the calf. It is the length most people picture when they hear the word sock, and the length that survives being worn with almost any shoe.

The construction is a ribbed cuff, a knitted leg, a turned heel, a foot and a linked toe. What varies between a cheap crew sock and a good one is not the shape but the cuff: how deep the rib runs, how much elastane sits in it, and whether it still holds its position after forty washes.

Cuff depth and rib. A 1x1 rib reads dressier and grips tighter; a 2x2 rib is softer and more forgiving across calf sizes. Tell us the depth in centimetres, not "standard" — standard means something different in every market.

Foot construction. Flat knit for a sock that disappears inside a shoe, terry sole for cushioning and warmth. Terry adds bulk, so it has to be decided before sizing, not after.

Yarn weight by season. The same crew pattern in a fine combed cotton and in a brushed winter blend are two different products with two different costs. Split them into separate lines rather than one line with two yarns.

Size bands. Most crew programmes run two or three bands rather than one pair per shoe size. Fewer bands means lower minimums and simpler stock, at the cost of fit precision.