The latest version of Columbia's most versatile piece of outerwear ever, the Columbia Whirlibird IV Interchange Plus Size Jacket is a waterproof breathable fortress with a zip-out insulated liner. You can wear just the shell if it's warm and wet, just the liner if it's clear and a tad cool, or the whole shebang if its cold and miserable out there. Featuring the Omni-Tech™ waterproof breathable fabric system and Omni-Heat™ 100% polyester insuation in the liner, the Whirlibird IV comes ready for riding action with and adjustable hood, powder skirt and underarm venting.