Make sure you get it right when buying this essential piece of kit.

1. If we are unconscious and go over the side of the boat, the automatic gas inflated jacket will require no input to inflate it. A manual gas jacket is cheaper, but it will require a sharp pull on an actuator cord to inflate the jacket. In reality, the automatic version is worth considering, especially on a sailing boat where a blow from the boom is a possibility.

2. Ensuring that the selected jacket has a fully adjustable crotch strap will stop the jacket from riding up in the water and slipping over your head. Those of us sailing may also want to consider a jacket with a harness attachment for moving around on deck safely in rough weather or during a night cruise.

3. Buy the right buoyancy of lifejacket for each crewmember. Ten Newton’s is equal to 1Kg of flotation. Usually a 150 Newton jacket is suitable for a small adult or child, although you need to ensure the jacket fits properly and is suitable for the weight of the person. Always identify individual lifejackets with a name marked in waterproof ink to avoid mistakes.

Please remember, a lifejacket is only a lifejacket if worn correctly.

For more advice about choosing and buying lifejackets click here.