Merrell put Air Cushion and stride alignment components under a slide, then opened the windows on its mesh upper to let the breezes in. A subtle, foam-padded collar hugs the foot without chafingSlip Lasted ConstructionBreathable Ventilator Air Mesh UpperSynthetic Leather CollarBreathable Mesh Lining4.5 Anatomical FootbedNylon 6.6 Injection Molded Arch ShankVentilated EVA Footbed With Antimicrobial LiningQ-Form Triple Density Compression Molded EVA Footframe with Integrated Merrell Air CushionMerrell Encore Sole/Sticky RubberVegan-Friendly FootwearWomen's Weight: 15 ozs.