The zip goes to about the waist. As a jacket the desired length is adjusted by the bottom securing drawcord. So you wouldnt unzip it but move drawcord. But to answer the essential question janne, YES you can draw up to knees and walk. Thats how I use it most. So great for working around wet woodland camp.Can you unzip the lower end, up to your knees, and poke your lower legs out and walk?