Our soft and lightweight driver-style, goat grain leather glove is fully lined with a para-aramid blend for ANSI level A4 cut protection. We've used a cut-and-sewn knit for optimal fit. Since seamless string knits are ambidextrous, and as such tend to cause bunching in areas like the thumb. Goatskin has high-tensile strength and abrasion-resistant properties and is often referred to as nature's strongest leather. Our cut-and-sewn liner dons much more easily than a seamless knit, since it is tailored to the hand using a much finer-gauge knit than a regular string-knit cut-resistant glove. Because of this high strength-to-weight ratio, our Endura® goatskin all-leather drivers are much tougher and more durable than their suppleness leads you to think. Keystone thumb provides extra durability. Arc flash testing placed these gloves at level 3, with an arc thermal performance value (ATPV) of 36 cal/sq-cm. Note: these gloves are designed for spark and flame resistance, not thermal contact.