Fleece-Lined Polartec Half Zip Jacket Two of the toughest performance fabrics meet to make the Indestructible Performance Half Zip. The jacket combines the lightweight, hi-tech warmth of the Polartec Power Grid fabric and the abrasion resistance of our ToughDry® Fabric. The patented grid construction knit of the Grid Fleece strengthens performance efficiency by increasing warmth and breathability, while also reducing fabric mass. These geometric patterns improve compressibility, sweat-wicking, and add technical style. By reinventing thermal warmth possibilities, Power Grid is a minimalist design that maximizes fabric performance. The elbows and shoulders of the indestructible jacket are reinforced with our ToughDry® fabric that is built with Nylon for added abrasion resistance during low crawls and underneath your ruck. This is the same fabric proven year after year in both Challenge Pants™ and Challenge Windbreakers at GORUCK Selection®. It's tough as nails, lightweight, wicks moisture, and performs flawlessly no matter the environment.