They claim it's 90% cotton but it's definitely not, it's more synthetic. Also, I washed them at the temperature indicated by the manufacturer and they shrank a lot, causing them to slip off my foot now. Another terrible purchase!

Good socks with 90% cotton.
It says they shouldn't be put in the dryer. I put them in and luckily they shrank very little

I give it one star because I know very well that 90% cotton is... The socks have a lot more synthetic material which, as known, creates various issues in terms of hygiene, foot temperature, etc. Let me mention just one characteristic, as soon as I wore them today with athletic shoes... my foot was slipping inside the shoe with every movement. The texture also clearly indicates that they are not so cottony. If you want truly cotton socks, avoid this product, I will try to return them