Abstract: A personalised cap (10) for use with a protective helmet is disclosed, having crown and brow portions (12, 14). The brow portion (14) is removable independently of the crown portion (10), and an alternative brow portion (14?) is provided for use when a environmental protection hood is to be worn under the helmet. An alternative crown portion (12?) also may be provided. A hood for use over a helmet and a hose for use to provide air to a respiratory mask, a mask and fittings for attaching a mask to a helmet are also disclosed. The environmental protection hood may comprise a manifold (412) having an element external to the hood, for receiving supply of services needed within the hood, and an element internal to the hood, for providing those services where required.