The Good Slipper Buckle Mule combines eco-friendly materials with cosy winter style. With a recycled RPET upper, plush lining, 100% recycled padded insole, and buckle detail, it's crafted for comfort and sustainability. Walk away happy! 90% Recycled RPET Polyester Upper with Buckle Detail. Super Soft Organic Cotton Sock and. 100% Recycled Foam Footbed for Added Comfort. Durable Natural Rubber Sole for Added Grip. These shoes have a regular and comfortable fit..