The lightweight mesh upper is breezy on warm days, and it’s durable enough to withstand the demands of the trail. Designers cushioned the ride with a compression molded EVA foam midsole and set the shoe atop a 33 mm stack height for a soft, protective feel. Altra then coated the Olympus 4.0 in a sticky Vibram MegaGrip outsole studded with TrailClaw lugs for complete control on unpredictable terrain. With Altra’s signature FootShape toe box for improved comfort, the women's Altra Olympus 4.0 is ready for any trail. Weight 9.6 oz Drop 0 mm Cushioning Max Category Neutral Surface Trail Use Everyday training NWOT