When the jacket should come off
Short answer: Take the jacket off before you start to sweat, not afterwards. Sweat in the inner layer makes you cold later, and it is easier to take a layer off than to dry one.
Why the timing matters
Once you have sweated, the inner layer is damp, and damp fabric against the skin cools you. Take the jacket off before you get warm, and the inner layer stays dry all day. So the outdoor temperature does not decide the moment. How warm you have become does.
The signs it should come off
Warmth at the back of the neck and damp skin on your back are the first two signs. When you notice them, take the jacket off straight away instead of waiting until you are hot. Once the sweat is there, it is too late. See bamboo sweatshirt for men as a layer under the jacket.
What to do with the jacket
Tie it around your waist or put it in the bag. If you carry a bag, that is often easiest, since you do not have to think about the jacket while walking. Tied around the waist, it needs to sit firmly so it does not fall off. See bamboo t-shirts for men and bamboo undershirt for men as the innermost layer.
When it is cold outside
The rule still applies when it is cold outside. Take the jacket off when you step onto the bus, into the shop or into the office, and put it back on when you leave. It takes a few seconds, and you avoid sitting and sweating in clothes made for outdoors. It only takes a habit.
Why you get cold afterwards
Damp fabric carries heat away from the skin, so a wet top feels cold when you stop moving. Many people know that chilly feeling after walking fast and then sitting down. The jacket is not the problem. The problem is that the moisture stays in the layer closest to the body.
If the inner layer is already wet
If the inner layer is already wet, change it if you can. If you cannot, keep moving until you get indoors, and do not stand still in wet clothes, because the cold takes hold quickly. A dry spare inner layer in the bag is a simple way to solve it.
Pick layers that are easy to remove
Pick layers that are easy to take off and put on, without fiddling with many buttons or tight sleeves. A jacket with a front zip comes off faster than one you pull over the head. The easier it is, the more often you do it, and the drier the inner layer stays.
Build a fixed routine
Make it a fixed routine to take the jacket off when you come inside or when you feel the warmth building. After a few days it happens by itself. You do not need to measure anything or look at a thermometer, because your body gives you the signal if you listen in time.
In short
The jacket should come off before you are sweating through, not after. That keeps the inner layer dry, and you avoid the cold feeling later. If you have a bag or can tie the jacket around your waist, it costs almost nothing. It is a simple habit for a more comfortable day.
Frequently asked questions
What if it is cold outside?
Take the jacket off indoors and put it back on when you go out. It takes only seconds and keeps the inner layer dry, so you do not get cold when you step back out into the cold air.
Why do you get cold after sweating?
Because damp fabric carries heat away from the skin. When you stop moving, the wet top feels cold, which is why avoiding the moisture is better than having to dry it afterwards.
What if the inner layer is already wet?
Change it if you can. Otherwise keep moving until you are indoors, and do not stand still in wet clothes. A dry inner layer in the bag solves it quickly.
You can find the full range at Bamboo-Clothing.com.
