Made to Go with the flow, our fan-fave sneaker keeps its signature breathable comfort while hitting the refresh button with a new elevated aesthetic and more springy support. Features & Design: lightweight and breezy, flexibly conforms to your movements, help your feet stay cool, silky-smooth material, so soft you can wear sockless, minimizes odor, machine washable, low carbon footprint, padded insole, tree upper, bio-based eyelets, recycled laces, lightweight sole, Allbirds Men's Tree Runner Go, Medium Grey, Size 12.5