This means that there are no limits to your activities - from leisurely to via ferrata, everything is possible. In addition, the outsole made of Continental rubber ensures a secure grip even in wet conditions. So you can trust the AX4 to get you safely to your destination. Features - Terrex AX4 Regular fit Laces Mesh and synthetic upper Dual density EVA midsole Continental rubber outsole Primegreen Technology Primegreen The reliance from adidas on virgin polyester means they’re on a mission to find solutions. Primegreen is one of them. Made from recycled ingredients, Primegreen is a series of high-performance materials that are changing how adidas make their products, giving you a more sustainable choice.