Mother Nature doesn't always give you a heads-up when the temperature is about to drop. For those days, make sure you pack the Men's Avant Featherless Vest. This vest features 3M™ Thinsulate™ Featherless insulation for lightweight warmth even when wet and down-proof 20-denier woven baffle construction. Shield your hands from the cold in the zippered pockets. This packable vest zips into its own stuff pocket for space-saving storage.