Vibram... plastic... Vibram... plastic... headexplode.gif
I don't know, and I've never heard it, but seeing the video of their process I could believe how the factory has some seasonal affective discord.
Before disc golf I made pies and some of them would have specific anomalies in the summer, from a warmer cool-down environment. It probably matters a lot to molders. Even our hotstamping works better in the summer.