High-rebound TRUFOAM rocker sole and Axis Chassis propel you forward and cushions each step. Exclusive XC4 breathable, waterproof construction and materials. Exclusive TRUFOAM sole delivers a bouncier, lightweight, cushioning excellent flexibility. Soft neoprene sock for slip-on ease with laces to adjust fit. Removable, memory-foam cushioned insole with contoured arch support. Dual-width footbed can be easily removed to accommodate a custom orthotic or wider foot.