The CANNON KNIT: knitted for comfort, eco for Mother Nature 100% vegan, ultra-light and comfy. Made from recycled and bio-based materials. These might be the lightest (0,4 lbs) shoes you will ever own! Materials and Features Upper: The knit construction brings comfort & breathability to a whole new level. Our Knit is OEKO TEX certified. Made of 4 recycled plastic bottles . 100% organic cotton laces. Insole: 100% natural cork, harvested algae foam and EVA make a perfect sustainable combo for utmost comfort. Removable insole. Outsole: natural algaes and EVA brings lightness & cushioning while rubber reinforcements guarantee maximum durability. 11 gallons of clean water returned to habitat per pair (BloomFoam tech). 27 m3 of air cleaned per pair (BloomFoam tech).