Dyneema® Arm Protection is Cool! One of the most distinguishing Dyneema® characteristics is its cool-to-touch property. Dyneema® fibers inherent ability to dissipate body heat and pass moisture from inside of the sleeve to the outside, results in longer wear time which promotes greater protection. The 9318D10T is a 10 gauge Dyneema® sleeve with a thumb hole that is 18 inches in length. (Non-vending packaged option - 9318D10T).