Life jackets are one of those bits of kit everyone knows they should take seriously. But in practice? They’re often misunderstood, poorly fitted, or only worn when the weather turns nasty.
Whether you’re buying kids life jackets, upgrading adult life jackets, or trying to work out whether a buoyancy aid is enough for your style of boating, this guide breaks it all down in plain English.
No scare tactics. No fluff. Just what actually matters when you’re on the water.
What Is a Life Jacket (and How Is It Different From a Buoyancy Aid)?
The terms life jacket, lifejacket, life vest, and buoyancy aid are often used interchangeably, but they don’t all mean the same thing.
Life jackets
Ocean Safety XF 170N – Automatic Lifejacket with Harness
A life jacket (also called a life preserver or life vest) is designed to:
Keep you afloat even if you are unconscious
Turn you face-up in the water
Provide enough buoyancy to support your airway
These are what most people mean when they talk about adult life jackets, kids life jackets, or baby life jackets.
Buoyancy aids
Helly Hansen Buoyancy Aid / Rider Vest
A buoyancy aid provides flotation but:
Assumes the wearer can swim
Does not guarantee turning you face-up
Is usually lower buoyancy
They’re popular for kayaking, paddleboarding, and dinghy sailing, but they’re not a substitute for a proper lifejacket in all conditions.
Do Lifejackets Actually Work?
Yes. When worn correctly, lifejackets work extremely well.
According to RNLI data, wearing a lifejacket dramatically increases survival rates in accidental immersion, particularly in cold water where cold shock and muscle cramp can set in within seconds.
The catch? They only work if:
They’re the right type
They fit properly
They’re well maintained
You actually wear them
A lifejacket stowed under a seat doesn’t help anyone.
Download the RNLI guide to lifejackets PDF
What Does 150N Mean on a Lifejacket?
You’ll often see ratings like 100N, 150N, or 275N on lifejackets. The “N” stands for Newtons, a measure of buoyancy.
Common ratings explained
100N – Calm waters, light clothing, generally inland use
150N – Most common choice for coastal and offshore boating
275N – Heavy clothing, tools, or extreme offshore conditions
Around 150N, such as the Crewsaver Crewfit 165N Life Jacket is ideal for most adult boaters.
For more extreme conditions, look no further than the Crewsaver ErgoFit 290N Extreme Automatic Lifejacket.
Choosing the Right Life Jacket for Adults
When it comes to life jackets adults trust, comfort matters just as much as safety. If it’s uncomfortable, people won’t wear it.
Adult life jackets to consider
Automatic inflatable lifejackets – Inflate on water immersion
Manual inflatable lifejackets – Inflate when you pull a cord
Foam lifejackets – Always buoyant, no inflation needed
Inflatable adult life preservers are popular for cruising and fishing because they’re lighter and less bulky, while foam flotation vests suit watersports and dinghy sailing.
Life Jackets for Kids: What Parents Need to Know
Life jackets for kids are not just scaled-down adult versions.
A proper children’s life vest should:
Support the child’s head
Keep their airway clear
Have a crotch strap to prevent ride-up
Include a grab handle for quick recovery
For younger children and non-swimmers, always choose a foam life jacket, not an inflatable.
Baby Life Jackets: Are They Different?
Yes – and they’re essential.
A baby life jacket (usually for under-15kg) is specifically designed to:
Turn the baby face-up quickly
Support the head and neck
Stay securely in place even in choppy water
Fit is critical here. Always follow the manufacturer’s weight guidance and adjust the straps carefully.
Do You Have to Wear Lifejackets on a Boat in the UK?
This is a common question, and the answer surprises people.
There is no blanket legal requirement in the UK that says you must wear a lifejacket on a private boat. However:
Commercial vessels often have strict rules
Hire companies may require them
The skipper has a duty of care
The RNLI strongly advises wearing a lifejacket whenever you’re on deck, in a tender, or in cold water conditions.
Common sense goes a long way here.
Do You Need a Lifejacket in a Kayak?
Another frequent search – and again, context matters.
For kayaking:
A buoyancy aid is often acceptable on calm inland waters
A lifejacket is recommended for coastal kayaking or colder conditions
Cold water shock doesn’t care how strong a swimmer you are. It's always worth familiarising yourself with the British Canoeing Safety Resources.
Do Lifejackets Expire? And When Should They Be Replaced?
Yes, lifejackets do not last forever.
How long do lifejackets last?
Foam lifejackets: typically 10 years if well cared for
Inflatable lifejackets: 5–10 years depending on use and servicing
Replace a lifejacket if:
The fabric is damaged or UV-degraded
The inflation mechanism fails inspection
The bladder leaks air
It no longer fits the intended wearer
Manufacturers recommend annual servicing for inflatable lifejackets.
Are Crewsaver Lifejackets Worth It?
A Crewsaver lifejacket is widely regarded as one of the most reliable options on the market.
Robust build quality
Comfortable designs
Clear buoyancy ratings
Strong UK marine heritage
They’re a solid choice for anyone boating regularly, especially offshore.
Final Thoughts: The Best Lifejacket Is the One You’ll Actually Wear
The perfect lifejacket isn’t the most expensive one on the shelf.
It’s the one that fits properly, suits your boating, and stays on your body when it matters.
If you’re unsure, ask. A good chandlery will help you get it right.
Life Jackets & Buoyancy Aids at Morgan Marine Chandlery
Quick FAQ
Do lifejackets work?
Yes, when worn correctly and properly maintained.
What does 150N mean on a lifejacket?
It refers to buoyancy in Newtons; 150N is suitable for most coastal boating.
Do lifejackets expire?
Yes. Foam and inflatable lifejackets both have a limited lifespan.
Do you have to wear lifejackets on a boat in the UK?
Not legally in all cases, but it’s strongly recommended.
