About Size and Material----Size (Very important): There is some difference between Asian sizes and yours, please read the size chart carefully before placing an order. If you want a looser size, please buy one or two sizes larger. Material: Made of 95% Polyester and 5% Spandex, super comfortable, lightweight, breathable and skin-friendly to both mommy/daddy and the sweet babies. Supportive Hands-Free Carrying---- A smart way to keep your baby comfortable, protected, and close to your chest, this baby wrap carrier lets you move, shop, and work freely. Intimate Design---- Different from other kangaroo pocket t-shirt, this baby wrap carrier can put the infants' legs outside which can offer them much more comfort. And it is double-sided stitching, which improves the strength and postural stability, babies are as warm and safe as they are in the arms of mom and dad.Applicable---- It is a T-Shirt and also a baby carrier sling,easy to tie and easy to breastfeed in. It even acts as a privacy shield for nursing moms because you can nurse while wearing it, without taking your baby out of the wrap. Baby Seat---- Ergonimic seat for baby, ergonomic weight distribution for mom and dad Each time you tie the wrap, you create a CUSTOM seat for your baby. Knee to knee support every time