Even though it doesn't look like it, The North Face made its Men's ThermoBall Insulated Vest without plucking a single feather off of a goose's back. PrimaLoft's synthetic ThermoBall insulation mimics the round clusters that make up down insulation in order to combine the benefits of down with synthetic. That means that this vest feels just as warm as 600 fill down insulation, weighs as little as a down vest, and still retains its warmth in wet weather like synthetic. The ThermoBall also compresses into one of its zippered hand pockets, which is excellent news for backpackers, skiers, and climbers. Its nylon shell is sure to keep this vest strong through many years of adventures.