Much better than the model X1A

Initially, javais bought the X1A model (27dB attenuation) lai and I returned because I felt that it wasnt quite effective. Back then (in July 2014), the X4A coutait 2 times the price of X1A!
I do not regret at all having changed X4A model because it is more efficient, including in lower frequencies, while having the same footprint.
Datténuation 6dB difference, believe me this is a lot!

A lusage, the headset is very comfortable, light. Personally I do not feel any discomfort.
He shakes his head enough to ensure a good seal (very important for linsonorisation). The "width" contact is flexible enough to tightly wrap the sides of glasses.
The headband adjustment is very simple (the photo speaks delle people) and does not move.

The 3M brand is well known in the industry, the look of this variety is very nice, and I find the quality / very good price.