When battling challenging terrain and cruel conditions, we stay warm, dry, and light in the Mountain Hardwear Storm Whisperer Insulated Jacket. The featherweight build features rugged ripstop fabric and lofty down insulation to shrug off sharp rock and trap heat, as the Pertex Shield tech completely shuts out ice crumbles and spindrift while retaining optimal breathability, so we feel protected, not stifled throughout battle.