Quote Originally Posted by Cari
Velogirl, which SLR do you use? I checked a catalog that has Selle Italia and found 8 different SLR models, two of which had cut-outs: The SLR XC Gel Flow and the SLR XP Gel Flow.
SLR Trans Am. If you look at the original SLR, it's the exact same profile but with a cut-out (and almost no padding). Both the XC and XP are wider in back and have more cush.

It's not sold retail in the US, however it came stock on a number of bikes about three years ago (including Giant, Cannondale, and Orbea), so you can pick them up occassionally from LBS who took them off the bikes or on eBay. Last year it was sold retail in Europe (but still not in the US).