Rusty Trusty Thermos

If you don't have one of these in your dive bag you're doing it all wrong.  Unlike our tropical counter parts, Spearos in New England dive in some less than hospitable conditions.  When the air and water temperature don't want to rise above 55 degrees, you need all the warmth you can get. 

A warm freediver is more relaxed, which leads to better dive times and hopefully more fish.  A wetsuit works by keeping a thin layer of warm water against the skin and by insulating against the cold water outside.  The best way to prolong your warmth in the water is to start your dive with warm water in your suit.  Or better yet, hot water.  

The thermos is last piece of dive equipment that goes in the truck before leaving the house.  This ensures the slurry of water and conditioner (aka lube) is steaming hot when you're ready to slip into your wetsuit. 

Just make sure you bring enough hot water for your dive partner too.  Or they will be on-shore shivering before you are cold enough to get out of the water.