There are many manufactures of thermal protection today; they offer wide range of products: from thick undersuit for cold water to thin ones for warm water.
But Fourth Element Company developed a breakthrough product. They decided not to thicken the insulating layer but to reduce the air circulation in it. The less the air circulation, the less heat it gives off. At the same time there are no the extra air which obstructs keeping buoyancy when changing depth.
Due to this technology, the undersuit proves to be remarkably warm while not being overly thick. Additionally, it can be worn in a wide range of temperatures – it’s comfortable to dive in Fourth Element’s Arctic undersuit in temperatures as low as 10 centigrade and as high as 26 centigrade. It keeps your body’s temperature stable.