What makes Thinsulate™ insulation so important to a cold weather boot? Three words: thin, warm, light.
Thinsulate insulation works by trapping air molecules between you and the outside. The more air a material traps in a given space, the greater its insulating value. Because the microfibres in Thinsulate insulation are far finer than other fibres, they trap more air in less space, which naturally makes it a better insulator.
The unique fibres of Thinsulate insulation are about ten times smaller than the fibres of other synthetic insulations, which means they’re much more efficient at trapping air…and much more effective at keeping you warm.