Visibility is excellent, and it holds up to plowing through thick undergrowth.
Living in the Toronto Beaches area, Aero and I take many long off-leash walks at night along the boardwalk. With her collar on, I can see Aero wherever she is, and I always know if she is on the move or standing still, investigating something. As Aero and I are involved in retriever training and hunt tests, the collar has also been useful during our nighttime training sessions. I can't say enough good things about the collar and to top it all off, the colour of the collar itself is so soothing. I've had lots of Toller people inquire about the collars after I raved about them online, as well.