The dual tether is for children who weigh more than 60 pounds and use a lap-only seat belt. The dual tether will attach to a RideSafer Delight at the shoulder clips and tether to two different tether anchor points. It is rated up to 80 pounds. When using the tether and the lap-shoulder belt, because the seat belt is doing the vast majority of the upper body restraining and not the tether, they can use the single tether all the way up to the 80 pounds. The dual tether is only required when the vest is doing all the restraining in a lap-only belt situation.