Racers Alpinestars are made of Kangaroo (motogp anyway).
Protection is always going to be a compromise with strength and comfort.
As for the Galfer waveys I use them on my bike, the major advantage is weight, the bike now turns much quicker, initial bite is improved. Not had them long enough to measure brake pad wear. They look ace!
I'll see if I can find a set, what year is an MC21?
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http://www.rgv250.co.uk
http://www.thetuningworks.com