97% cotton 3% lycra.
Sizing
Correct sizing for pouch slings is essential for the happiness of both mom/dad and baby.
Find your best fit with Hotsling's Size Calculator (use pre-preg weight, if you get more than one size recommended and have big boobs, broad shoulders, a big 'ol baby, or wear bulky clothes, pick the larger size).
Don't know how to wear your baby in a Hotsling? Go here to see some great instructions.