The last thing you need to do is reach for your Spare-Air and it is no longer attached to you! Safety leash keeps you from losing the Spare-Air. Safety Leash allows you to quickly unleash the Spare-Air to give it to another diver. This isa necessity for all Spare-Air users. Safety Leash works with all Spare-Air styles and sizes. Leash will extended out to 4 feet for comfortable buddy breathing.