i think you'll fnd that just about any seat with stuff like that or any kind of stitching will tend to attack your shorts. my old flite gel did it, and my specialized avatar REALLY had something against shorts. now i just have some generic ass buster seat that gets along nicely with the shorts.
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"When once you have tasted flight, you will forever walk the earth with your eyes turned skyward, for there you have been, and there you will always long to return." - Leonardo daVinci