They don't heat up the ear. You can wear them comfortably for many hours at work.
The headphones are very good. They don't provide complete isolation from ambient sounds, but for me at the workplace that's convenient because if a colleague talks to me, I'll notice it.
The microphone works perfectly without transmitting normal sounds from the work environment.
The only negative is their price, which has gone very high. The price fluctuation chart on Skroutz (select the entire time period) is interesting. It's one of those products with continuous and large fluctuations.

I bought these headphones for my work at a call center four months ago and I am very satisfied. Customers can hear me clearly, the headphones have a mute button and a volume control. They are quite lightweight. The only drawback is that after 5-6 hours the headphones become a bit uncomfortable on the ears.

For their price, they are expensive considering that the noises from the environment can be heard. They are lightweight and comfortable to wear for many hours, but they do not isolate the sounds. Very expensive for what they offer.

I have used them both for work and in my personal space mainly for gaming. Let's see some positives and negatives.

Positives:
Headphones: The Jabra headphones have very good sound quality, not at an amazing level but they are quite satisfactory. Personally, I really like the intensity and how clear the sound is.

Microphone:
What they offer to an incredible extent is complete isolation from ambient sounds. Let me show you to understand, because I use a mechanical keyboard and it makes noise, in the past, those I was talking to could hear the noise when I was typing, but now that is no longer the case. Also, many have mentioned that they can hear me perfectly, very clearly, and most importantly... Others only hear your voice. Someone enters the room, they speak loudly on the other side, and... nothing. The microphone completely isolates breaths, voices, and sound interventions.

Build quality:
The build quality of the headphones is made of reinforced plastic, they are very lightweight, the foam that touches the ears is soft and it relaxes my ear. From what I have researched, it is hypoallergenic and even after hours of use, I feel like I'm not wearing them. They are truly comfortable.

Negatives:
Unfortunately, their price is prohibitive, although lately their value has dropped below 80€. Hopefully, we will see them at a lower value.

In summary, they are a great choice for those who want a comfortable solution for work or gaming and most importantly... Complete isolation from external sounds. Happy shopping.