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The Mountain Equipment Particle Vest provides core warmth without hindering flexibility, which is essential when mountaineering, ski touring, or even scoping out pow at the resort. 3M's Polarloft Featherless insulation provides the lightweight feel and heat retention of down while offering the weather resistance and breathability for which synthetic insulation is renowned. Stretchy side panels refuse to inhibit our reach. And when we've warmed up, this packable vest stows into its pocket and in our pack--at less than nine ounces, we'll barely notice the change in weight.