A Triclimate jacket is a double-layered jacket with a waterproof, sometimes windproof, outer shell and a softshell inner jacket. The two layers can be separated, allowing for versatility in how warm you want your jacket to be. Wear just the outer jacket, with a durable water-repellent (DWR) finish as a rain jacket. Separate the inner lining puffer or fleece jacket for lightweight warmth. Combine both for an extra-warm insulated jacket that acts as a waterproof jacket, windbreaker, and warm winter jacket.