Cold-water preparation involves more than wetsuit thickness. Water and air temperature, wind, session duration, fit, skill and the possibility of an unexpected swim all matter. A clothing chart cannot guarantee that a session is appropriate for you.
Choose thermal protection for the activity
Use the wetsuit manufacturer’s guidance as a starting point and check fit, seams and freedom of movement. Compare compatible boots, gloves and a hood where needed. Test whether you can operate your equipment with the selected layers. If uncertain, seek advice from a qualified local instructor before launching.
Plan the return to shore
Check the forecast, wind direction, entry and exit points. Sail with others where possible and tell someone ashore your plan and expected return. Carry an appropriate means of calling for help and understand how to use it. Choose flotation equipment intended for the activity: an impact vest is not automatically a buoyancy aid or lifejacket.
Understand cold-water shock
The RNLI identifies water below 15°C as cold water and explains that sudden immersion can seriously affect breathing and movement. A wetsuit does not remove every risk. Use the RNLI’s guidance and local safety advice when planning your session.
Prepare dry clothing on shore
Have dry layers and a changing robe ready, separate from wet kit. Use the robe on land: it is not intended for swimming or as flotation equipment. If conditions exceed your ability or you cannot arrange a reasonable return plan, do not launch.
Explore the range
Related guides
Choosing a Changing Robe for Watersports · Windsurf Setup for Gusty Wind
Further reading: RNLI: cold-water shock