Be seen. Stay dry. Come home.
Open water is rewarding and unforgiving in equal measure. This is the short, honest guide we'd give a friend before their first season — and the thinking behind why we build the CAIRN the way we do.
Six things, every swim
Be visible
Boats, paddlers and spotters can only avoid what they can see. A high-visibility buoy on the surface above you is the simplest, biggest safety upgrade you can make.
Check the conditions
Water temperature, current, tide, wind and forecast — before you commit. Conditions on the shore are not the conditions 200 metres out.
Never swim alone
Swim with others or where you're watched. Tell someone on land your route and expected time out of the water.
Respect cold water
Enter slowly and let your breathing settle. Cold-water shock is the immediate danger — acclimatise over several sessions and keep early swims short.
Know your exit
Pick your exit point before you start, and a backup. Plan for the wind or current pushing you past it.
Carry the essentials
A whistle to signal, dry layers for after, and a way to call for help kept dry. Get out, get warm, get dressed quickly.
The first 90 seconds matter most
An involuntary gasp and rapid breathing can cause you to inhale water, even if you're a strong swimmer. Enter gradually, keep your head up until your breathing is under control, and never jump straight into cold water. If you feel your stroke or coordination failing, get out — that's early hypothermia.
A visibility tool, used well
The CAIRN does two jobs that matter in open water: it keeps a high-contrast marker on the surface so you're seen, and it keeps your phone, keys and dry layers sealed and with you.
- High-visibility colour spotters can pick out in glare and chop
- 15L dry storage so your phone and warm kit come with you
- Built-in whistle to signal if you need attention
- Tows on a waist leash — out of your stroke, always there
Open-water FAQ
A high-visibility buoy makes you far easier to see — the single biggest safety factor in open water. But it's a visibility and dry-storage aid, not a flotation device, and it doesn't replace swimming with others, checking conditions and planning your exit.
No. A swim buoy like the CAIRN is a visibility marker and dry bag. It must never be used to support a swimmer's body weight or relied on as a lifejacket.
High-vis orange and pink generally contrast best against water and glare; hi-vis yellow stands out well in flat light. The CAIRN comes in all three so you can match your usual conditions.
Below roughly 15°C, cold-water shock is a real risk for unacclimatised swimmers. Enter slowly, build up over several sessions, keep cold swims short, and learn the signs of hypothermia.