Snug Bud

These wearable hot water bottles are every wild swimmers dream. Stuff your underwear in them and wrap your base layers around it whilst you go for a swim. Then sling it round you once you’re out. You can wear it on your front or back.  They heat you up gradually and even have a super cosy fleecy pocket to put your hands in.  

Once you have one, you won’t know what you did without it!