Caterpillar Framework Safety Boot ST S3 HRO SRACaterpillar Framework Safety Boot ST S3 HRO SRA The 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. Available in: Black, Seal Brown To see more from Caterpillar, visit the Caterpillar Collection