Main article: EX-Fusion
Metamo-Rings function similarly to Potara as they allow two people wearing a Metamo-Ring to fuse together. However unlike Potara Fusion, EX-Fusion requires the fusee to both wear a Metamo-Ring on their arm and perform the Fusion Dance in order to fuse, as opposed to Potara Fusion which occurs automatically without the need to dance once the conditions are met (with each fusee wearing the Potara on the opposite ear). Like Potara Fusion, the resulting fusion lacks Metamoran clothing and instead the two fusee's clothing also fuse together, however unlike Potara Fusion, the two Metamo-Rings fuse into a single Metamo-Ring which is worn by the resulting fusion. When this single Metamo-Ring is removed by the EX-Fusion, then they will defuse.