100N jackets tend to be of a foam construction for buoyancy and for use on inshore & coastal waters. They give a reasonable assurance of safety from drowning in calm waters but not guaranteed to self right an unconscious user wearing waterproof clothing and should not be expected to protect the airway of an unconscious person in rough water.
150N jackets can use airfoam or air only for floatation and can be used in most conditions giving a reasonable assurance of safety from drowning to people not fully capable of helping themselves but may not immediately self right an unconscious user wearing heavy waterproof clothing.
275N jackets have buoyancy provided by air only and are aimed at users who are offshore wearing heavy waterproof clothing in severe conditions. They give a greater assurance of safety from drowning and while they cannot guarantee to self right an unconscious user the buoyancy they provide should ensure they will in the majority of cases.
Manual or automatic option:
A manual operated life jacket delivers full buoyancy in approx 5 seconds by way of pulling a lanyard that fires a CO2 canister to inflate the life jacket. The life jacket can also be inflated by mouth but do not breathe in the contents of the life jacket once it has been inflated with CO2. The automatic inflation operates when the paper retaining collar releases when in contact with water, with the CO2 canister being pierced and thus inflating the life jacket within 5 seconds. Can also be inflated orally. Note: the auto version user should bear in mind that this is not a suitable option for use in a small boat as a wave breaking over the person wearing the life jacket will in all likelihood set the life jacket off.
This is aimed at the sailor that may need to be clipped on to the boat and therefore reducing the chance of being lost overboard in rough weather or when working on deck. Harnesses are of a strong construction with a stainless steel ‘D’ ring for attaching a harness line too.