PC Advisor has taken a look at some gaming chairs, they go into some good detail on the specification and what they think about the chairs. 
http://www.pcadvisor.co.uk/test-cen...2016-2017-uk-best-chair-for-pc-games-3641761/
http://www.pcadvisor.co.uk/test-cen...2016-2017-uk-best-chair-for-pc-games-3641761/