Ideal for active adventurers, the Siren Edge Shoes are built with a partially 3D printed mesh upper and breathable lining. Merrell's M Select(TM) FIT.ECO footbeds provide contoured comfort and organic odor control, while Vibram(R) outsoles deliver traction and slip-resistance for any number of outdoor activities.. . Merrell Eligible for ground shipping only. Mesh and 3D print mesh upper. Breathable mesh lining. Bellows tongue keeps out debris. Merrell M Select(TM) FIT.ECO blended EVA contoured footbed with organic odor control. Merrell air cushion in the heel absorbs shock and adds stability. Molded nylon arch shank. Vibram(R) high-performance rubber soles are durable and slip-resistant. Weight: 1 lb. 4 oz..