When anything is able to resist caustic chemicals and barnyard acids, you know it is a superiorly durable product. Imagine that level of protection, while also keeping in mind that it has roughly 3 times the strength and is able to resist abrasions 2 ?? times better than traditional leather. Impressed? You certainly will be! The upper of this Georgia Carbo-Tec Lacer work boot has been fashioned out of SPR leather, which possesses all of those great attributes. The lace-up design is nice, because it allows you to adjust the fit (as needed) throughout the day.