Spirit Ruby Style Adjustable CPAP Chin Strap is made from high quality breathable materials with reinforced real Velcro straps provides the patient with and comfort. Cups the chin at a lower angle to provide maximum support and stay secure all night with its flowing single-strap design and ultra-wide comfort bands. Ruby Adjustable is accessible in two sizes Standard and Extra Large. The Standard chinstrap changes with a most extreme size of roughly 22 - 24 inches. The Extra Large chinstrap acclimates to a most extreme size of around 26 - 28 inches