What is the purpose of the channel in my seat? Is it just for comfort or does it have some medical benefits?
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The purpose of the channel in a bike saddle is to reduce pressure to the perineum, which can cause numbness and other long-term problems. This is a matter of both comfort and health, although not everyone is affected. Individual body type, saddle design, bike fit, and riding style work together to make saddle fit a very personal issue.
On a related note, some of the worries about erectile disfunction seem to be overstated, though this is still an open area of research. See: Saddle Seats and Erectile Dysfunction - The myth Exploded.