LS2 FF327 Challenger Fold Carbon 頭盔

Excellent helmet but the noise is killing me. Thus 4 stars. Let me explain.
I ride a 2007 Honda CBR1000RR. I was looking for a second helmet with inside sun visor. My primary helmet is Shoei NXR 2 Fortress.
I have this helmet 1 month. I don't know how it will be during the summer (I'm in Greece).
Pros:
1. Very light, same as my Shoei (both size S).
2. Big visor with excellent visibility, looking left or right and good when your chin touches the tank.
3. Quality product, well done made, awsome helmet.
Cons:
1. It makes noise to my left ear, noticeable above 80 km. I don't know what's fault. As the speed increases the noise increases too. Not recommended for long travel or without ear buds.
2. Difficult to tie or untie the strap with gloves.

The helmet is definitely not quiet, but this is not its main minus. There is a constant turbulence of air under the chin.
It is a little shake to the sides after 90 km/h.
Of the pluses, only a good view through the visor.