Good for the Enviroment and Good for your feet; The Opal Trainer is crafted from 100% Recycled Textile Knit Upper and also includes a memory foam comfort insole, perfect for on the go- 100% Recycled Textile Knit Upper- Flat Cotton Lace Up Fastening- Memory Foam Comfort Insole- Breathable Textile Sock and Lining- ZeroG: Built with Super-lightweight Materials, this Outsole Keeps Your Feet at Ease all Day Long.