NEW Mens Allbirds Tree Flyer Buoyant Yellow Running Shoes 。Allbirds Men\'s Tree Flyer Buoyant Yellow (Blizzard Sole) Size : 12.5 Condition : New, no box More Bounce, Less Ounce. Go faster and farther with the new Tree Flyer. Lightweight, super springy, and wildly comfortable, this distance running shoe makes your extra efforts feel effortless. SwiftFoam Saves The Day. New high-performance midsole is big on cushion and energy return, making long runs easier on your body. Stability For Miles. External heel counter and flared, geometric midsole help keep your stride steady. Feel The Breeze. Lightweight, breathable eucalyptus fiber upper provides next-level comfort. * Low Energy, High Performance. Innovative low-heat foaming process means our new SwiftFoam midsole production requires significantly less energy. * Bio-Based Bounce. Thanks to the mighty castor bean, our SwiftFoam midsole is 48% bio-based. * Recycled Stability. External heel counter made entirely of scraps from the SwiftFoam midsole production process. More Plants, Less Plastic. Signature FSC-certified eucalyptus tree upper blend replaces the usual fully oil-based polyester or nylon upper without sacrificing any performance. Compared to traditional materials like nylon, our tree fiber cuts our carbon footprint in half.