Finally, the last criterion to consider is the intensity of your hike. The more intense the hike, the more you'll sweat, which means you'll need a ventilated jacket. When there's a ventilation zip, we talk about mechanical ventilation. These are generally located under the arms but some pockets also have mesh which helps perspiration wicking.
For improved ventilation, wear breathable clothing under your jacket and remember to leave the cuffs and the bottom of the jacket unfastened.
If you plan to walk in the rain for a long time, wear a poncho over your jacket which will provide complete waterproofing and help protect your backpack.