Caterpillar CAT Spiro S3 black waterproof steel toe/midsole work safety bootsSafety Category : S3 Marking Code : S3+HRO+SRC Features Midsole Antistatic Water Resistant Toe Protection Resistance to high heat Heel energy absorption Electro Static Dissipative Composite midsole Slip resistant Waterproof Description The Spiro is built with all of the features you would expect from a Cat work boot. Featuring ERGO; a series of design principles that work together to deliver footwear that promotes foot health by integrating stability,