You will gain 20% more warmth once inflated, in fact this very practical vest regulates your temperature, you adjust through a valve inside the amount of air (air is the best insulator) to find your comfort, the cells can reduce cold spots to wear as a lining of our jacket or outer jacket, windproof and water repellent fabric lighter than a fleece, easily folded into its jacket. delivered in its bag and can make you an excellent pillow slightly inflated.
It is not necessary to inflate the vest all the way.
This vest can also help you float but can in no way replace a life jacket.
back length of 70 cm for size M