For a 159cm splitboard would you recommend...
For a 159cm splitboard would you recommend S or M size?
Small is likely the call. The skin and the strap have some stretch, but you can't make the Medium any shorter.
In regards to this, I just received my size small G3 Splitboard skins for my Solution 158. I've never used skins before, so Im not sure how they are supposed to fit exactly, but, I had to adjust the tail clips on the strap to the very longest setting, and it just barely fits. The actual skin material is quite a long ways from the tail in my opinion. Im not sure if it would be best to return these and go for the mediums or to just stick with these and hope that I have enough surface area to keep me stuck to the steep skin tracks?!