Site 2Page 3Page 4Page 5Page 6Page 7Page 8Page 9Page 10Page 11Page 12Page 13Page 14Page 15Page 16Page 17Page 18Page 19Page 20Page 21Warmth. Insulation issues, but exactly how much of it depends upon The everyday winter temperatures you might be in. Down jackets will usually specify its "fill power," or the amount of down is inside; jackets with a f