Spira WaveWalker - Spring Loaded Walking - Black - Mens 10.5 E US leather An all-purpose walking shoe designed for those who prefer comfort with maximum cushioning benefits and to aid in the reduction of fatigue and overuse related to walking issues. Encapsulated WaveSpring Technology (EWT) in the heel is a new patent pending design process which encases the WaveSpring within a polyurethane midsole. This technique provides maximum cushioning benefits for the ultimate in cushioning and comfort. Tri-spring model is the WaveWalker DX3. New performance walking last with broader forefoot- higher instep- and a narrow heel for the perfect fit. Strobel mid and rear foot with toe lasted construction. Upper is made of leather.