Moncler Jackets are worth buying given their feather down, and design.
Down jackets are so-called because they contain down, the fluffy feathers found in the undercoat of a duck or goose. Some cheaper down jackets also contain small feathers.
Eastern Mountain Sports, Eddie Bauer, REI and Cabelas sell men's down jackets. Each of these retailers also has an online store where you can purchase the jackets.
Down jackets are filled with natural bird feathers, providing excellent warmth and insulation. Insulated jackets, on the other hand, use synthetic materials to provide warmth. Down jackets are typically more suitable for colder weather conditions as they offer better insulation and are lighter in weight compared to insulated jackets.
Unfortunately Columbia does not rate their jackets by warmth the way they do the sleeping bags, so there is no way to know.
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There are numerous retailers where one can purchase Down jackets for men online. They can be purchased online from 'Go Outdoor', 'Amazon' and 'Dick's Sporting Goods'.
Goose down jackets, coats, featherbeds.
Rab jackets would generally be worn in the fall and winter months. Rab jackets are primarily made for alpine skiing and other winter sports. They are usually down filled.
From looking at Google shopping, the price for women's down jackets ranges from around $150 - $300. There are a few exceptions to this price range, such as a $436 jacket from Altrec, but generally a down jacket costs around $200.
The highest down fill power available in the market for premium quality winter jackets is typically around 900 fill power. This indicates the quality and insulating ability of the down used in the jacket.
Synthetic insulated jackets offer lightweight warmth, quick-drying properties, and insulation even when wet. They are also more affordable and easier to care for than down jackets.