What is the difference between buoyancy aids and life jackets

Quite often in the shop someone will ask for a buoyancy aid. No problem, we have lots to choose from. However, once we show the customer what a buoyancy looks like, they say something along the line of

Crewsaver MK3 Buoyancy Aid

Choosing the Right Watersports Safety Gear: Buoyancy Aids vs. Lifejack – Watersports Warehouse

Radial 5420, Baltic Radial, Baltic Buoyancy aid, Baltic Radial Buoyanc - Marine Warehouse Ltd

What is the difference between buoyancy aids and life jackets? – Viking Marine

How to choose a buoyancy aid

Baltic Life Jackets & Buoyacy Aids

What is the difference between buoyancy aids and life jackets? – Viking Marine

What is the difference between buoyancy aids and life jackets? – Viking Marine

Life Jackets and Buoyancy Aids

Life Jackets and Buoyancy Aids

Life Jackets v Buoyancy Aids - What's the difference? - Pirates Cave Chandlery

PFD (Buoyancy Aids) Vs Life Jacket – Everything you need to know – Best Coast Water Sports

What is the difference between a lifejacket and buoyancy aid?, News

Buoyancy Aids or Life Jackets: what's the difference?