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My experiences with shin bang and what I have learned as a 6'4 person who's calf sits over the boot:
There are 3 types of shin bang I have come to notice and experience. You can consider some of this broscience if you want, but this is what I have found in terms of shin bang through my experience:
1. Shin bang caused by overuse of the dorsiflexor muscles from backseat skiing
2. Shin bang caused by being too tall for your boots and having a skinnier lower leg. This leaves space in between your liner and your shin, putting a good amount of force on your shin whenever it slams forward into the boot.
3. Shin bang right on the bone of your shin from being in a liner that does not cushion your shin enough.
When I first came out to Utah, I legitimately thought skiing backseat was the way since I watched steezy park videos from the mid-late 2000s. I quickly developed shin bang type 1, and learned to ski properly instead, but my boots were way too big for my feet. I got boots that I thought fit more properly, but they were still too big after I packed out the liners, and I developed type 3 and type 2 shin bang again. I fixed this by wearing a booster strap under the shell and over the liner, and that worked for awhile, but because the liner was still packed out, I developed type 3 shin bang again after a bit.
This year, I thought to myself, if taking up enough space in my boot is the issue, why not slap an intuition power wrap in there for max space taking uppage. What I discovered was that the cork in an intuition liner is very tough and it didn't quite fit the shape of my foot the way that I wanted it too. That cork beat the crap out of my shins. I developed Type 3 and Type 2 shin bang again very quickly, probably the worst I've ever had it. I had a day this year where I legitimately had to stop skiing which had never really happened before.
The fix:
Swapped out my intuition liners for the stock liner, got a pair of those eliminators for shin cushioning, an put a booster strap on my boot, and wore the normal power strap under the shell to keep the liner tight to my shin. I think that this will be my setup for the rest of the year, and possibly my life, or until I pony up and get a zip fit liner which is much softer. I don't have a hook up on those, so that will be in my middle age. Thus far, it has worked very well. I was coming off of some godawful shin bang and only gave my shins 3 days rest, before going back to skiing. I skied 2 days on, took 1 day off, another 2 days on, and I didn't have a lot of shin pain at the end of the last 2 day stretch.
With shin bang, if you have it, you have to give it time to heal and try something different with your boot. What worked for me may not work for you, but there's no harm in trying. A lot of dealing with boot issues is just experimentation in my experience. The steps seem to be:
1. Don't ski backseat/land backseat
2. Make sure your shin is sufficiently cushioned
3. Make sure the liner of your boot is tight to your shin so your shin is not slamming forward consistently in the boot.