Caterpillar Framework Safety Boots ST S3 WR HRO SRAThe Framework is built with all of the features you would expect from a Cat work boot and then some. Includes all the features that promotes foot health by integrating stability, flexibility and comfort. Steel toe Full Grain Leather Upper Nylon Mesh Lining Composition: Fastening: Lace up Upper Material: Full Grain leather Lining: Nylon Mesh Sole: Rubber