Cassin X-Ice Leash
Here's what other sites are saying:
Keep your hands on your axe and prevent an axe-less fall when you attach the Cassin X-Ice Leash. The adjustable, bi-directional design supports pulling both downward and outward, so you can have extra security on overhangs and mind-boggling moves up the icefall. Padding on the wrist provides a comfortable resting place for your arms as you reach for gear. The X-Ice was built for Cassin X-Tools, but will fit onto most ice climbing tools.