This is a great little accessory. Slide the cable through your jacket sleeve, hook the loops at the end of the cable onto the HelmetLok or MirrorLok (sold separately) and attach it to your bike.
Alternatively, if your helmet does not have “D” rings, run the cable through your helmet’s chin piece, loop the ends through your HelmetLok or MirrorLok and lock it to your bike. Now your Jacket AND Helmet are locked to your bike. The cable will recoil back to its original length and will easily fit in your pocket. The cable is made from 3mm thick nickel plated steel cable, is only 4.33" (11cm) long when coiled, stretching to over 70" (180 cm) and has a load capacity of 100 kgs.