We like to describe TNF's ThermoBall™ Eco insulation as "Great Balls of Fire" to customers in the store who aren't familiar with the product, and it's an apt description for the insulating power even when the jacket is wet. The North Face ThermoBall™ Eco Jacket stashed in your pack or kept in your car is the ideal way to guarantee your day doesn't turn into cold misery when the weather goes south. This years TNF ThermoBall™ Eco Jacket features improved quilting pattern and an updated fit.