Buoyancy Aid or Life Jacket — What's the Difference?
It's the most common question we get asked, and it's an important one. The two terms are often used interchangeably but they are not the same thing.
- Buoyancy aid (also called a PFD — Personal Flotation Device): designed to keep a conscious swimmer afloat and aid swimming. They are close-fitting, comfortable, and designed for active water sports like SUP, kayaking, and canoeing. They will not automatically turn an unconscious person face-up.
- Life jacket: designed to turn an unconscious person face-up in the water and keep their airway clear. Typically bulkier; recommended for offshore sailing, open-water crossings, or any situation where you may be far from help.
For SUP, kayaking, and most inland and coastal paddling, a buoyancy aid / PFD is the appropriate choice. This guide focuses on choosing and fitting one correctly.
Do I Legally Need to Wear One?
In the UK, there is no blanket legal requirement to wear a buoyancy aid on inland waterways or coastal waters — but:
- Some waterways (particularly the Canal & River Trust network and certain rivers) have local bylaws or operator requirements that mandate wearing a PFD.
- The Maritime and Coastguard Agency (MCA) strongly recommends wearing one whenever you're on or near the water.
- Many outdoor centres and guided tours require participants to wear one.
- For children, a buoyancy aid is essential and non-negotiable.
Our position: always wear one. The risk simply isn't worth it, particularly in the UK where water temperatures are cold year-round and cold water shock is a leading cause of drowning.
Understanding Buoyancy Aid Standards
In the EU and UK, buoyancy aids are rated by the amount of buoyancy they provide, measured in Newtons (N):
- 50N (ISO 12402-5) — minimum buoyancy for calm, inland water where help is close. Designed for confident swimmers. Common for SUP, kayaking, and dinghy sailing.
- 100N (ISO 12402-4) — greater buoyancy for coastal and offshore use. Will support an unconscious person face-down (but will not reliably turn them over).
- 150N (ISO 12402-3) — lifejacket territory; will turn most unconscious people face-up. For offshore, open-water, or commercial use.
- 275N (ISO 12402-2) — for extreme offshore conditions.
For stand up paddleboarding, kayaking, and general watersports on UK inland and coastal waters, a 50N or 100N buoyancy aid is the standard recommendation.
How to Choose the Right Buoyancy Aid
1. Match It to Your Activity
- SUP: look for a low-profile vest style with minimal bulk around the arms for a full paddling range of motion. Back pockets and hydration compatibility are useful for longer sessions.
- Kayaking / canoeing: a snug-fitting vest with side adjustment; look for models with chest pockets for kit access while seated.
- Dinghy sailing: slightly more buoyancy and often a front zip or belt for ease of donning.
- Open-water swimming support: belt-style PFDs or tow floats (note: these are different from buoyancy aids).
- Children: always use a product specifically rated and sized for the child's weight. Never put an adult PFD on a child.
2. Get the Sizing Right
Buoyancy aids are sized primarily by chest circumference, not height or dress size. Always measure around the fullest part of your chest.
| Chest Size | Typical EU/UK Size |
|---|---|
| Up to 80 cm | XS / Child Large |
| 80–90 cm | S |
| 90–100 cm | M |
| 100–110 cm | L |
| 110–120 cm | XL |
| 120 cm+ | XXL |
Always cross-check against the specific manufacturer's size guide — sizing can vary between brands.
3. Check the Fit
A well-fitting buoyancy aid is snug but not restrictive. Here's the quick test:
- Put the aid on and fasten all buckles and zips.
- Adjust side and shoulder straps so the aid sits flat against your chest with no gaps.
- Get someone to lift the aid by the shoulder straps. It should not ride up over your chin or ears. If it does, tighten the waist straps or size down.
- Raise your arms above your head — you should have a full, comfortable range of motion.
- It should feel firm but allow deep breathing.
Common fitting mistakes: leaving straps too loose (the aid rides up and can come off in the water), or buying a size up for comfort (the extra room reduces effectiveness).
4. Consider Additional Features
- Pockets: handy for VHF radio, energy gels, phone in a dry bag
- Whistle attachment point: some waterways require a whistle; look for a dedicated loop
- Reflective strips: useful for low-light conditions
- Hydration compatibility: handy for longer SUP tours
- Crotch strap: prevents the aid riding up in the water; essential for children's models
Caring for Your Buoyancy Aid
A buoyancy aid is a safety device — treat it accordingly:
- Rinse in fresh water after every saltwater session
- Air-dry in the shade — UV degrades foam buoyancy over time
- Store away from direct sunlight and heat
- Inspect regularly for torn seams, damaged buckles, or degraded foam
- Replace if the foam has compressed, smells of mould, or the outer fabric is worn through
- Most buoyancy aids have a recommended service life of 5–10 years with proper care
Shop Buoyancy Aids at EGL Sports
Browse our full range of Buoyancy Aids & PFDs, including options for adults, juniors, and children from leading watersports brands. Pair with our SUP accessories or wetsuits for a complete kit setup.
Not sure which model is right for your activity? Get in touch — our team are paddlers too and happy to point you in the right direction.