In extreme cold, why do you need a jacket with ventilation?
You have probably already experienced this! During a winter hike, the effort quickly becomes intense and generates heat, TOO MUCH heat. It’s also well know that enemy no.1 isn't lack of heat but rather perspiration. Some simple rules to follow: adapt your rhythm to perspire as little as possible, wear several layers and use mechanical ventilation as often as necessary. This 3-in-1 parka helps to optimise this, as for the rhythm, we trust you!