Air Mesh upper The Iso blends modern construction techniques with simple yet classic aesthetics to create an extremely clean looking, lightweight shoe focused on maximizing comfort Action Fit - anatomical performance fit - LXVI\'s proprietary fit features a higher heel height to mimic the fit of running shoes, while maintaining a balanced feel Waffle Flex - modernized flexible tread design with recessed centers to reduce weight and increase flexibility Ultracush Lite midsole and Footbed, LXVI\'s products utilize custom versions of EVA and open cell foam for lower weight PleasureCuff - heel and collar construction that uses a lycra coated neoprene cuff wrapped around a soft layer of open cell foam