Bamboo long johns and when you need another layer
Short answer: A long john is a pair of long underpants that covers the whole leg. It is worn under trousers in the cold and under outdoor workwear, where a single layer is not enough to stay warm.
What it is for
Long johns add a thin, dry layer between your skin and your trousers. They hold in warmth and move sweat away, so you do not get cold when you stand still after moving. That combination is what makes the difference on a cold day. See bamboo long johns.
When you need another layer
If you feel the cold through your trousers while waiting for the bus, cycling to work in winter or standing still outdoors, it is time for an extra layer. The same goes for outdoor work, football matches, hunting, fishing and walks in the wind. Indoors you rarely need them.
Why bamboo rather than wool
Wool is warmer, but some find it itchy, especially directly against the skin of the legs. Bamboo viscose does not itch and moves moisture well in moderate cold. That makes bamboo long johns comfortable all day, even when you move in and out of warm rooms and do not want a layer that gets too hot.
When wool is better
In hard frost, and when you stand still for many hours, wool is warmer than bamboo. If you work outdoors below freezing all day or sit still in a hunting stand, it can pay to choose wool or wear an extra layer on top. For an ordinary mild winter, bamboo is usually enough.
Fit under trousers
Long johns should fit closely. If they are loose, they fold under your trousers and chafe at the knees and thighs. Choose the same size as your usual bamboo underpants for men. The legs should reach the ankle without bunching, so they can be tucked into your socks.
The top that goes with them
A long sleeved undershirt does the same for your upper body. It keeps your back warm when your jacket rides up and moves sweat away from your torso. Together with long johns, it gives a full base layer that you put on in the morning and forget about. See bamboo undershirt for men.
Layer on layer
Three thin layers are warmer than one thick layer, because there is air between them. Long johns next to the skin, ordinary trousers in the middle and windproof, waterproof trousers on the outside is a good setup for cold days. You can take off the outer layer indoors without changing completely.
Washing that keeps the shape
Wash long johns at 30 to 40 degrees and avoid high heat in the dryer. Heat can make elastane lose its stretch, and then they sit looser on the legs. Hang them to dry. They dry quickly, so if you wash them in the evening, they are ready the next day.
Use all winter
Many wear long johns from November to March. With two pairs, you can alternate and always have a clean pair ready. They take up little space in the drawer, but make cold winter mornings and long days outdoors far more comfortable, even when the weather changes during the day.
Frequently asked questions
What is a long john?
A pair of long underpants that covers the whole leg and is worn as a warm layer under trousers. It holds in warmth and moves moisture away from the skin when you are outdoors in the cold.
Is bamboo warm enough for winter?
For an ordinary winter, yes. In hard frost and when standing still for hours, wool is warmer, so then it is a good idea to choose wool or add an extra layer on top.
Should long johns be tight?
They should fit closely, but not squeeze. If they are loose, they fold under your trousers and chafe. Choose the same size as you wear in your usual underpants.
