Playonair, made in USA.
Adjustable air cushion. One size suits violins from 1/2 to 4/4 and viola.
7 out of 8 found the following review helpful
Pros: Better than not having a shoulder rest at all.
Cons: Hit and miss design. Some can't be inflated, despite trying all methods short of resorting to using tools [which would have invalidated the warranty].I had to get a replacement for the first one I bought, which the shop did provide free of charge. Not particularly comfortable, and quite expensive for what it is. Tends to come unclipped too easily at random.