Georgia Boot built the upper of this men?s dark brown Carbo-Tec Wellington out of SPR leather; it has been tanned in a manner that allows it to have 3 times the strength and the ability to resist abrasions 2 ? times better than ordinary leather ?it?s also able to withstand exposures to caustic chemicals and barnyard acids. To armor these composite-toe work boots against weighty objects that might fall unexpectedly upon them and electrical dangers, they have been built in compliance with the ASTM F2413 Protective Toe Classification and its Electrical Hazard Standard.