Sock It To Me writes, "When you need a mental boost these sloths will be here for you every step of the way...literally! As long as you're wearing this trusty pair!" 52% COTTON, 45% POLYESTER, 3% ELASTANE EXCLUSIVE OF ELASTIC. Our combed cotton threads are certified by OEKO-TEX® Standard 100, which means we leave out harmful chemicals to keep your skin safe and happy. Approximately fits women's shoe size 5-10, men's shoe size 3.5-8.5.