British Army combat Mk6 helmet, with desert camouflage cover.
SOLD
 
The Mk 6 came into service in the 1980s and was designed to accept modern ear protection, Bowman personal radios, and respirators.
The helmet is manufactured by NP Aerospace and is reported to have an "almost unlimited service life" by the manufacturer.
The Mk 6 is often mistakenly thought to be made out of kevlar when in fact it is constructed of "Ballistic Nylon" - nylon fibre.
The helmet was replaced by the Mk 7 helmet from June 2009.
 
The British Army Mk6 was used during The Gulf War 1990-1991 and the most part of The Iraq War 2003-2011. 
 
source: https://en.wikipedia.org/wiki/Gulf_War#United_Kingdom (edited and citations removed).