It's cheap, but not what I expected from Alpinestars. I understand it can't be too thick that it won't fit with your race suit. But it's pretty darn thin.
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The NUCLEON KR-TB features a lightweight and easy to use back protection extension for the lowest part of your spine (coccyx).
Can be fitted on the KR-1, KR-R and KR-2 back protectors.