Thanks for the advice everyone, it's appreciated My own preference for material is nylon, but I really want the stud closure. My Charge Ti has the nylon sheath and, after a few years, the velcro is totally dead and the cover just flaps around. It's the only let down as the rest of it is absolutely mint - there's not one stitch missing.So I think I'll buy the leather sheath and try to sort out something on my existing one to keep it shut, as well. That way I'll have both options covered. Cheers,Mark