The Official Online RBS 6 Nations Store is open. The store has everything you need to get behind your team during the RBS 6 Nations, plus the store is now fully stocked with a much wider range of rugby merchandise.
"The Ospreys are the leading region in Welsh rugby, it's a forward thinking and ambitious set-up that clearly has an exciting future and it's fantastic that I'm going to be able to play a part in that over the next four years," Griffiths said.
"There are some outstanding props in the squad, I'm competing with Adam Jones for the shirt and then you've also got Duncan Jones and Paul James as well as some great youngsters coming through.
"It is the kind of environment you want to be involved with, where you are having to work hard and are being tested every day in training."