For your safety:

If an energy absorbing lanyard is used in conjunction with a cross-arm anchorage connector, other anchorage extension, vertical lifeline, or horizontal lifeline, the additional length of the anchorage connector, or sag from the lifeline must be taken into consideration during the clearance calculation process.
Never attach the unused leg of the lanyard back to the Full Body Harness at any location other than an approved lanyard storage keeper.


From Factory:

KSEIBI Shock Absorbing Lanyards are full featured internal shock absorbing lanyards that expand from 4½ to 6 feet in length to keep the user unencumbered by their own fall protection gear and, to minimize entanglement with equipment while the lanyard is attached to the user's back D-Ring.
Incorporating continuous length shock absorbing material, durable tubular web jacket, impact indicators and protective label covers, KSEIBI Elastic Lanyards help take the burden out of fall protection.