The basic design of a ring sling is a long piece of fabric looped through two rings (ideally aluminium) forming a seat or cradle for baby. It is worn over one shoulder and is fully adjustable, so it can be fitted to suit the size of baby and wearer by adjusting each edge of the hanging tail.
Ring slings are great for carrying a newborn, either in an upright or reclining position. The ring sling can also be used right up to toddler age depending on the supportiveness of the fabric.
They can be especially useful with older babies who are at the 'up and down' stage, as it is very quick and easy to place baby in and out of the ring sling, and they fold up nice and neat so they can be carried with you.