Columbia Suntech Vent Flip PFG Women's Flip Flops Synthetic Made with quick drying synthetic leather and hydrophobic lining. The midsole is constructed with Techlite for superior cushion and high energy return with air-flow and water drainable midsole ports. The outsole is made with Omni-Grip non-marking traction rubber. This style runs large. We recommend ordering 1/2 to a full size down.