The KneeZoomer All-Terrain Knee Walker is great for use indoor & outdoor. Built with functionality in mind with a removable basket and an easy folding frame for transport. This model has 2 different folding points, making it our most compact knee walker yet. 12" pneumatic tires are used to ensure a smooth ride outdoors. Contoured knee pad to ensure comfort for patient during use. Our All-Terrain model has the best turning radius in the industry, allowing for a truly indoor/outdoor product without compromise. We understand how important durability is for these products, which is why we use premium materials in the knee pad, brake cable, and wheels (we use 12" Pneumatic vs. PVC which is mostly used elsewhere).