Size Chart  - please note this size chart is in lbs, not kgs. 

Sizing only affects the legnth of the tail.  You will always be able to tighten or loosen our sling as much or as little as you wish.

If two people will be using the sling as in the example of a man and woman, choose the size that fits the woman, and if the man is larger, he will generally just have a shorter tail, but be able to use the same sling.

If you are particular large-breasted and fall close to another size, you might consider the next larger size.