I've been thinking about these for a few years and just didn't get around to making them.
Lowers are deflectors that mount to the forks and deflect the wind away from your legs and keep it from kicking up under the windshield and into your face.
The solution I came up with is fairly simple; easily acquired materials and hand tools will get the job done.
Before you start, read all of the directions and look at your bike to determine what adjustments in materials you may need for the size and mounting conditions you need to work with.
If you plan ahead and purchase all the materials you need, you can complete these in about an hour.
Lastly, there will always be those that think these are not finished enough to put on their bike. So don't.
My bike is strictly for commuting and running errands. It is a workhorse and not a show piece (although it still looks pretty good.
I commute down to about 18 degrees F, so I'm more interested in utilitarian concerns during the winter than looks.
That being said, these things are a nice compliment to the windshield and homemade hand deflectors (see other Instructable).