The Merrell Women\'s Siren Traveller 3 are made with Vibram soles, which are high performance rubber soles with unmatched durability, stability and slip resistance.Full grain leather upperTraditional lace closureBellows tongue keeps out debrisBreathable mesh liningKinetic Fit BASE removable contoured insole for flexible supportMerrell Air Cushion in the heel absorbs shock and adds stabilityLightweight EVA foam midsole with zones of softer foam may reduce pronationVibram TC5+ rubber soleWeight: 1lb 7oz / 640G (full pair)