Suitable for all genders - for any and all funky folks with fun feet!!! SPECS: 80% bamboo, 8% spandex, 7% cotton, 3% nylon, and 2% elastic - SUPER SOFT! :) $1 from every pair goes into a "Charity Pot" - used throughout the year to support conservation and humanitarian aid as needed, as well as Mutual Aid.  SIZING: These socks fit most adult feet "well enough." They are incredibly comfortable, even if you have smaller feet and need to wear the heel a bit higher than normal. They are also very stretchy, and can accommodate larger foot sizes easily. All the socks are One Size, but they fit BEST for US sizes W 7 - M 12. My feet in these photos are a “Women’s” size 7 - you can see there’s a bit of wiggle room in the toes and heels but the socks fit comfortably. My partner also wears them, and their feet are "Men's" size 10/11 and it's a super comfortable fit. Socks fit larger feet as well, because they have good stretch. THE PACKAGE: You can wash your socks cold to keep them from shrinking. Otherwise, they will shrink slightly when first washed hot - a good tool if you'd like a little bit of a tighter fit!)