I use some...
plain label SAM splints in my work kit. Get em from BP Medical out of NYC.
They roll up small, can be cut easily into just about shape you'll ever need, won't deflate like an air splint and they're much cheaper.
I'd buy some original SAM's but frankly, they're just too damned expensive for what they are, thin sheet of aluminum covered with some foam in an item that's going to be thrown away after use.
It could happen any time
It could happen
or sunshine, love, salvation
It could you know, that's why we wake
and look out
No guarantees in this life but some bonuses
like morning, like noon, like evening...
like right now
William Stafford 1914-1993