In reply to John McKenna - Rockfax:
Like you say, around the ears. One side you can infinitely adjust height, length, (slippage each time put helmet on in winter) the other you can't adjust height, if that makes sense? The plastic band around the back, isn't attached to straps, only sits on top of buckles. If straps were threaded through this plastic band (like my Meteor), would provide a more constant fit. I really expected better from a premium brand like Mammut.
I replaced it with the new Petzl Meteor, since I had an older one I liked. The chin buckle is so much harder to engage, chin strap also slackens, an elastic band helps, than my older one! TBH, I much prefer wearing my older one, which resides in CIC!
Stuart