In reply to chris_r:
Unlike say the sole of a pair of wellies, which can be largely syntehtic, climbing shoes need a particular high grade of rubber.
For a few years now people have been warning about supply/production issues with the underlying rubber caused by increased demand (China) and perversely... ruinously low prices for the farmers especially the smaller ones. Rubber commodities are largely price driven by Shanghai. There were some hiccups in the supply this time last year and I think? this time the year before as well.
I wonder if Unparallel are experiencing supply issues around their RS and VD rubbers?