Two separate tubes that are made from a soft elastic fabric are wrapped around the body to form an X. The baby is placed against the adult’s body like in an ordinary baby sling.
Model: Babylonia Tri-cotti
I thought it was much easier to put on the baby sling than to wrap a bunch of fabric around my body. The disadvantage is that you have to buy the sling in the right size so it only fit me and not my husband.