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Worn as a midlayer or outer layer, we like the Norrona Trollveggen Thermal Pro Vest for a versatile winter fleece. The 295-weight Polartec Thermal Pro fleece traps warm air around our core to retain our body heat without much bulk or added weight. Norrona's warmest, most durable vest features a technical fit for easy layering, a warm and protective collar, two hand-warmer pockets, and a contrasting chest pocket for our phone.