It measures 1.5cm in the narrower part of the nose, 2.5cm in the middle part of the saddle where the nose turns into seat, and 3.5cm where the seat is the widest. It is a little wider still at the very back end of the saddle, but I figure that part's not too useful as far as cutouts go...
The Selle Italia website has good photos of it- but don't forget to look under "offroad" saddles.



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In my case I think it was from riding too narrow a saddle. Started with a Performance Womens Contour and moved to a SSM Atola. Both felt good in the sit bones but ended up putting too much pressure in the "Taint" area. When I measured my sit bones (using a yoga mat!) I determined that both saddles were too narrow (in the 140cm ish range width). Put an older Terry Butterfly on my mountain bike -- problem solved! Also bought a Selle Italia Lady Gel Flow for my road bike, but actually haven't tried it yet as I haven't gotten to road ride all summer for various reasons. It is similarly shaped to the Butterfly, tho, so I think it will work. It does have a blue leather cover, though, and I liked the waterproofness of the Shiver when I read your post, since I sweat on the leather saddles and leave dark discolorations. 
