With four-way stretch inserts that wrap from the side of your torso to your arm & upper back, the waterproof & breathable On The Mount Stretch Jacket is built for active adventures in foul, wet conditions. Omni-Tech fabric & a fully seam-sealed construction provide breathable waterproofing to keep the elements out while allowing excess heat & water vapour to escape as you increase the intensity of your activities. Underarm vents mean you can also release heat when things really hot up.