DAIWA Cold Weather Clothing Innerwear DU-3122S Danrotech Crew Neck Undershirt, Extra Thick, Black

Wearable fireplace [Danrotech] Extra thick and even warmer
Underwear that responds to temperature changes during the day and morning and evening due to the far infrared effect.
Developed to always maintain a comfortable environment inside the clothing with a soft, warm fabric that wraps around the whole body.
The back side is woven with hydrophobic (water-free) polypropylene material to prevent sweat from cooling, reducing the drop in body temperature caused by sweat cooling in winter.
This time, we introduce extra thick underwear recommended for fishing, which does not require much movement.
STRETCH
By using an excellent stretch material that follows intense movements, we have achieved a stress-free fit that does not feel tight and a comfortable fit.
Danrotech
Danrotech uses your own heat to keep you warm. People emit heat called "far infrared rays".
It is not the heat that is transmitted when the skin touches it directly, but the heat that you can feel even without touching it, and it is warmth like a fireplace.
The fabric absorbs and reflects the far infrared rays emitted from your body.
This keeps you at a comfortable temperature without getting too hot.
ANTIELECTRICITY
We use sewing thread that suppresses static electricity. It suppresses the unpleasant static electricity that occurs when putting on and taking off the clothes.