Hi,
It is no good for keyring or necklace carry but to solve the "cold, wet hands" problem I carry a couple fusee's (road flares) in my truck, snowmobile and ATV. Easy to spark up even with gloves on and will light just about a anything, good signaling device also.
To increase the potential of lighting a fire with cold, wet hands the use of accelerants helps a lot but you have to be very careful (eg BOOM). My partner at work carries a small bottle of gasline anti-freeze in his floater snowmobile suit pocket for just this reason.
Mike