
I've used these :-) The gencon all in one anyway (this is the lead attached to the head collar) I don't anymore because my daft Melvin snorted so much it was embarrassing. They are good though, and I easily walked 4 Labs using them.
They are webbing material, and they do a softer version which is particularly nice. As for the fastening, there is an adjustable fabric stopper that keeps the muzzle bit at the right side. The clip at the end can either go onto the gencon, or clip onto the normal collar (which is what I did). It doesn't sound or look particularly secure, but I never had a problem.