200g Insulation - Lightweight
200g is the minimum standard of insulation found in many basic, cold-weather boots. Lighter weight insulation levels can be the perfect choice, if you find yourself going outside for short periods of time. Boots with 200f insulation are just right if running errands where you will be going back and forth between a warm car, into a store and then back again.
If you tend to have naturally hot feet, 200g of insulation will help to avoid any excessive foot sweating that might occur. Many truck drivers who repeatedly go from the warm cab of their trucks into the chilly outdoors all day long prefer this level of insulation. In fact, in parts of New England, many men will wear 200g insulated work boots all year round.
400g Insulation - Midweight
400g insulation is the standard for those who work jobs that require them to always be out in the elements. This level of insulation strikes the perfect balance between keeping your feet warm without overheating them. The key here is the level of activity you do while working outdoors in the cold. Moving around moderately on an outdoor jobsite makes 400g winter work boots a great choice. Though you may experience some periods of inactivity on the job, the active work periods will build up and trap enough heat to keep feet warm during the slow periods. This level of insulation is great for winter construction sites, and outdoor winter projects.
600g - 800g Insulation - Hefty
If you find yourself being outdoors for lengthy periods of time without being constantly active, then 600g-800g of Insulation should be just what you need. When sitting around, or standing still for long periods of time, you will need this greater amount of insulation to securely trap the heat around your feet. This level of insulation would be a good choice for line technicians and road crew workers who stand motionless for long periods of time out in the elements during their work day.
1,000g - 2,000g Insulation - Maximum
A high level of insulation, such as 1,000g-2,000g or above, is crucial if you plan to be completely stationary while out in the cold for extended periods of time. This extreme level of insulation is a favorite of loggers, tree workers, those in the above-ground mining industry and those who spend the day out hunting in the woods, or sitting in tree stands for hours on end.