Lifeboatman's helmet
A lifeboatman's helmet is designed to protect the heads of lifeboatmen at their work in rough sea.

The sort described here is currently (7 September 2008) in use at Southport
Southport is a seaside town in the Metropolitan Borough of Sefton in Merseyside, England. During the 2001 census Southport was recorded as having a population of 90,336, making it the eleventh most populous settlement in North West England...

 lifeboat station in England.

It covers the same area as a motorcycle helmet
Motorcycle helmet
A motorcycle helmet is a type of protective headgear used by motorcycle riders. The primary goal of a motorcycle helmet is motorcycle safety - to protect the rider's head during impact, thus preventing or reducing head injury or saving the rider's life...

 including all of the ears, Its casing is thinner, and nearer to the size of the head, and has lengthwise ridges.

It has a transparent visor to keep sea spray
Sea spray
Sea spray is a spray of water that forms when ocean waves crash.-Make up:As a result, salt spray contains a high concentration of mineral salts, particularly chloride anions.-Effects:...

out of the eyes. It has a chinstrap.

Its lining is not padded but inflatable; it has an inflation tube (fastened to the chinstrap) ending in a red nipple (at the bottom of the first image) to inflate the lining by mouth to fit it firmly on the head.

It has a microphone and an intercom lead.
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