So, you finally found it, the versatile, breathable, on- and off-mountain mid layer of your dreams. The North Face Ventrix™ Mid Layer is made of a unique laser-perforated Ventrix™ insulation that keeps you warm during high-output activities in cold weather while still being able to breathe to aid in your thermo-regulation. Think of it like your not-so-secret weapon to throw in your pack for a piece you can use during a full day at the mountain and beyond, from the summit to the sidewalks of your hometown.