Mesh upper backed by GORE-TEX® membrane has the highest level of breathability while being completely waterproof without any unwanted bulk-up. Narrow gauge webbing and synthetic leather strapping provide support while anchoring speed lacing. Underneath it’s all about cushioning and alignment, with proprietary Merrell Air Cushion matched to Q-Form® stride-centering.   UPPER/LINING  Synthetic leather and mesh upper Bellows tongue keeps debris out GORE-TEX® extended comfort footwear lining keeps feet dry and comfortable M-Select FRESH naturally prevents odour before it starts for fresh smelling feet MIDSOLE/OUTSOLE Moulded nylon arch shank Merrell air cushion in the heel absorbs shock and adds stability Merrell QForm® Comfort midsole provides women’s specific stride-sequenced cushioning 5 mm sole lug depth Vibram® outsole   Weight: 0.485g