Abstract: An adjustable neck brace system with a brace body, elongate inserts, and engaging members. The brace body is made of flexible material, has two side edged and a top and bottom edge, and has a plurality of tunnels formed therethrough, with each tunnel having a first, smaller internal diameter when in an unstretched condition. The inserts are received in the tunnels. The engaging members are affixable in the vicinity of the side edges of the brace body and are used for retaining the neck brace around a wearer's neck. By selecting inserts that have an outer diameter that is larger than the first, smaller internal diameter of the brace body in its unstretched condition, the tunnels will be stretched, which also stretches the brace body, thereby lengthening the distance between the bottom edge and top edge of the brace body.