They really are 100% cotton! I'm mostly basing this on my past experiences with sweaty and smelly 80/20 cotton/poly socks. But what really matters is that I wear them for several days in a row (yes, the same pair) and they don't get smelly or uncomfortable. They wash well, I dry everything on a rope. I wear women's size 8.5. I like muted solid colors. I'm very picky about socks and so far I'm really liking these.
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