Designed for maximum alpine versatility, the Patagonia Calcite Jacket is the lightweight and packable shell that you want when the weather turns in an instant. It's made with Gore-Tex Paclite Plus, a waterproof and breathable fabric that's light in weight and packs down easily. When you pull the Calcite out of your pack you'll know that you've got full protection from the storm thanks to its durably waterproof construction and alpine-helmet compatible hood. You'll also know that you're staying comfortable as you hike, climb, or ski-tour due to Gore-Tex's high levels of breathability, a special textured backing fabric, and underarm vents to really help you cool off during warm summer showers and strenuous winter summit bids.