Duo = tandem compatible with our Duo Onbuhimo carrier! This carrier has the buckles needed to tandem with the Duo Onbuhimo seamlessly. This carrier is 1/2 the Duo system and to tandem baby wear you would need to purchase the Duo Onbuhimo.
Mer = everyday carrier that can go in water! Soft swim nylon and soft board short material plus some special foam, allow these carriers to be worn wet or dry. Swim material is light and breathable just like your swimsuits!