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For packable protection on the mountain, we stuff the Mountain Hardwear Premonition UL Anorak in our pack. When sunny skies suddenly turn gray, we unfurl this featherweight layer from its own chest pocket. The waterproof construction stops the rain from reaching us underneath yet still lets our microclimate breathe as we continue to climb steep terrain. When ridgeline winds start to turn droplets into weapons, we cinch the hood over our helmet and clamp the cuffs tight.