The Atom AR is the warmest offering in the Atom series, utilizing Coreloft™ 120/80/60g/m² in different zones to maintain optimum heat retention performance. The Tyono™ 30 on the AR is much more wind and water resistant than the 20 found on the most popular Atom LT.
The Atom AR is not a do it all piece and has a specific temperature range for usage. If you live in a colder climate where the highest temp is around freezing, this may be the right piece for you!