In-ears options would be more challenging as the ear tip needs fitting into the ear canal suitably and each person has their own ear shape. If the manufacturer does not make a good seal, the sound will leak easily and the listening experience will be ruined.
Comfort / Fit:
Headphones are a wearable device, thus, the way they fit into our ears is as important as the way they sound. You can see a wide variety of approaches when it comes to ergonomics and materials from different headphones. On-ears options make use of different ear pads. When it comes to this type, the pads will go around the ear, thus the ear cup opening needs to be suitable. For on-ear options, there should not be highly clamping force and the material needs being soft enough to wear even during long hours of use, without causing pain to the ears. With in-ears option, the ear canal should fit correctly. If it does not, the sound will leak.
Companies should pay attention into the weight of headphones when manufacturing along with the features integrated. The using experience is not achieved if your head or your ears are hurt after using for a while. This is more important if you are going to do exercises with them. You had better check the weight, which needs being reasonable, from the specification paper.
It is rather difficult to eliminate all the external noise from making your listening session annoying. Headphones makers should deal with this problem in different manners. With over-ears options, the thicker cushions placed in leather work rather well as they provide comfort for users. In-ears options would be more challenging as the ear tip needs fitting into the ear canal suitably and each person has their own ear shape. If the manufacturer does not make a good seal, the sound will leak easily and the listening experience will be ruined.
Bluetooth or wireless headphones are a new trend. But not all wireless headphones are made to be equal. For example, battery life may be rather short and comfort or fit features may be compromised in order to boost the wireless components. It is difficult for a company to balance the two features. After that, the sound quality is also a problem here.