Sussed it mate it is the extreme wide , i like the idea of the more robust edging which you dont get on the standard extreme which would mean the brush would last longer,
As once the edge of the brush becomes to damaged because of knocks against window reveals the bristles start falling out on the corner of the edge .
Had my extreme standard about year now and it is starting to bristles because of this problem .
It would be great if you could get the extreme standard brush with this edging down each side of the brush , AS i really like the built in scraper of standard .
Love the standard except for this problem. MIKE