I think MIPS must have partnered with whoever designed the POC Spin system. MIPS Integra is ALMOST identical. Spin was ahead of it’s time, which is ironic because I remember a lot of people wouldn’t buy it because it was different than the original “extegra” MIPS.
The point I was making about the retention structure being able to move is that you can make these helmets fit differently, which I think is what makes the Lemon one appear “longer”. Maybe this pic will help? See those little holes that the retention system locks into? On the Lemon one they’re near the front, which brings the dial further inside the shell of the helmet (I grew long hair and need room for it below the dial). On the Black one, I have it on the 3rd hole, which extends the dial further out of the shell (further down your neck), and I suspect that is why one is a few mm longer than the other.
Feel free to ask more questions if I can help.
