Minnetonka Women's Eco Spruce Clog Slippers An Earth-friendly slipper that can go anywhere with you. Featuring 100% recycled plastic fabric, a 50% recycled plastic lining and a lightweight durable sole that incorporates 5% recycled rice husk, these slip-on mules provide a new level of comfy coziness that’s sustainable, too. Plus – with the help of our non-profit partner One Tree Planted, every pair purchased plants one tree.