Columbia Drainmaker Walking Shoes. With bigger, more numerous drainage ports in the heel and forefoot, the updated Drainmaker III drains water 33% faster than its predecessor. Add siped lugs for increased traction on wet surfaces and new internal frame support and you’ve got an ideal lightweight, quick-drying shoe for staying safe and comfortable during extended waterside activity. Open mesh and synthetic upper. Techlite™ midsole, superior cushion, high energy return. Lower durometer EVA for the ultimate in comfort and shock absorbency. Air-flow and water drainable midsole ports. Omni-Grip™ non-marking wet grip outsole with razor siping outsole.