Altra 3 Sum -
When every ounce counts, slip into the lightweight Altra 3 Sum™ performance running shoe. From everyday outings to triathlons, this Zero Drop™ men's slip-on athletic shoe keeps you nimble and lightens your load with a seamless, synthetic upper and 5mm contoured footbed. Featuring Altra's Natural Ride System, this shoe includes a foot-shaped toe box that provides room for toes to move freely, improving both comfort and balance. Drainage holes channel away water after amphibious activities. A blown-rubber speed pod outsole gives you dependable ground control whenever you set out in the Altra 3 Sum™ running shoe.