To learn more not.

+ They can take out quickly and replace
+ Washable
+ Amazingly good seal, depending on how firm they are used

- Press uncomfortable after about an hour or two, at least for me. Therefore, they are not particularly well suited for learning because it sucks already.
- Sleep comes, not because they protrude a good distance from the ear, like a stick.

Conclusion: insulation good but not intended for continuous use!