At first glance the very idea of a zipper that unzips and zips up by itself seems somewhat ridiculous. After all, these contraptions are mostly used on pieces of clothing and gear where handling a …
I find it’s easier to regulate heat from the bottom zipper most of the time. Also if you have any belted gear or just need to grab something in your pockets it’s easier than a full unzip. Or if you’re a guy and you’re taking a piss.
Or you can grab the corners, wrap them up over your elbows and pretend you can fly.
While I knew your answer, I just went through a similar thing with a Costco jacket. It’s a winter jacket with a false fleece liner. As in, there’s a 2" strip inside the jacket, just behind the main zipper, that just zips up. While it can offer an extra inch of belly room after too much hibachi, the main benefit seems to be that it starts about 3" higher than the exterior zipper. It’s pretty good for driving in that mode.
I have a coat with two zips on the same zip. So I can zip it up and then I can unzip it up, I have no idea why this is supposed to be useful.
The bottom one is used to give more room when you sit down or need to get stuff from your pockets.
I find it’s easier to regulate heat from the bottom zipper most of the time. Also if you have any belted gear or just need to grab something in your pockets it’s easier than a full unzip. Or if you’re a guy and you’re taking a piss.
Or you can grab the corners, wrap them up over your elbows and pretend you can fly.
While I knew your answer, I just went through a similar thing with a Costco jacket. It’s a winter jacket with a false fleece liner. As in, there’s a 2" strip inside the jacket, just behind the main zipper, that just zips up. While it can offer an extra inch of belly room after too much hibachi, the main benefit seems to be that it starts about 3" higher than the exterior zipper. It’s pretty good for driving in that mode.
Clark Kent
Superman