UPPER: Performance mesh with leather overlays provides lightweight durability COMFORT: Speed lace webbing system with top collar hooks for a snug fit INSULATED: KEEN.WARM 200G insulation helps keep feet warm in temperatures down to -25°F CUSHIONING: KEEN LuftCore embeds light air-injected core into high-density foam for all day comfort TRACTION: High-traction rubber outsole with multi direction lugs for durable traction