Socks in rotation through the week
Short answer: Seven to ten pairs in the same colour and style is enough. Then you can pair them without looking, and a single hole does not ruin a pair.
Why identical socks are practical
With ten identical socks, every sock is usable in a pair. If one disappears, the other nine still make four pairs. With ten different pairs, one loss becomes an unusable pair.
How many pairs
Seven pairs means washing once a week. Ten pairs gives slack if the laundry is postponed. See bamboo socks for men.
Rotate them in order
Put the freshly washed ones at the bottom of the pile and always take from the top. Then all pairs wear evenly instead of three pairs wearing out while seven sit unused. See bamboo socks for women and bamboo trainer socks for men.
Frequently asked questions
Should you have different types
Yes, one set for trainers and one for boots covers most of it.
How long does a pair last
Six months to two years depending on use and material.
Should you replace them all at once
No, buy one pair at a time as each wears out.