I have the Thinline saddle fitter halfpad. It's basically a sheepskin pad with pockets to add Thinline shims into.
I absolutely love it. Very thick, plushy sheepskin and I can shim it as needed. Oddly enough the Thinline shims don't fit into the pockets so I've been using the shims from a Mattes halfpad (I don't like their shimmable halfpad at all, no sheepskin and weirdly stiff) when needed. Their shims are also much thinner than the Thinline ones so better amount of adjustment I think.