The soft silicone cord is fully adjustable to fit everyone and easy to tighten or loosen. DuraTech made-to-fit materials not only stand the test of time but also hold up through many uses. Approximate Product Dimensions: Adjustable C-Ring Adjustable From 0.7 in. (18 mm) to 2.5 in. (64 mm) Depth: 0.2 in. (5 mm)