Weather protection with extra mobility: For the Men's Impulse Flex Jacket, Jack Wolfskin have combined the waterproof performance of a hardshell with the comfort of a softshell, courtesy of Jack Wolfskin's Texapore Softshell fabric. It keeps you dry even in wind blown rain. When you sweat, the fabric supports your physical activity by expelling water vapour to the outside. And if you get too warm, simply open the venting zips under the arms for a quick blast of fresh air.The Impulse Flex comes with a few extra details to enable you to wear it with a pack: Both hip pockets are raised so they can still be accessed when the waist belt is closed. And the shoulders feature a highly abrasion resistant lamination over the area where the shoulder straps sit.