Keen Elle Backstrap Women's Sandals Eco-materials are used everywhere. These backstrap sandals combine comfort and style for a better fit. They are an ecological product that combines Keen's unique functions with a simple design that can be used in various styles. Stretchy Strap Upper The stretchy straps are made from 100% recycled PET plastic bottles and designed for all-day comfort. The straps stretch and move with your foot with every step that you take whilst ensuring that you stay secure and locked in. The straps are perfect for warmer weather and combine comfort and style for all-occasion wear and the stretch elastic back strap allows for easy on and off. EVA Midsole An EVA midsole provides significant cushioning and comfort to help improve the level of your performance so you can stay at your optimum level, for longer. Holding excellent cushioning abilities, the midsole absorbs shocks as you move throughout the gait cycle providing resilient cushioning and reducing the risks of potential injury. The EVA footbed yields superb cushioning properties allowing you to walk further for longer. Integrated arch support provides all-day-long comfort and ensures long-lasting stability. Non Marking Rubber Outsole A non-marking rubber outsole provides an abundance of grip and traction on a variety of surfaces to help give you a stable platform and minimises the risk of potential injuries and strain. The outsole will not cause damage or leave marks on indoor surfaces meaning you can wear the sandal around the house as well as outdoors.