and adjustable ridgeline... i am the proud owner of bright orange bouncing baby whoopie sling twins... the set are made from dynaglide and therefore i believe the lightest possible suspension. i got them in the mail today and ten minutes later was hanging between my chosen trees in the lawn. not a sign of slip. the ridgeline was an absolute joy. it took all of 5 minutes to find my sweet spot using this uber long whoopie. so to Opie, your work is appreciated and admired... everything works flawlessly. Thank you.