This headgear is designed to fit all Swift LT and Swift LT For Her Nasal Pillow CPAP/BiLevel Masks. Each headgear pack includes the straps, back buckle and top buckle. Light Blue headgear comes standard with all Swift LT For Her masks. Dark Blue headgear comes standard with all Swift LT masks. Both headgear styles can be used with all Swift LT Series masks and they are identically sized.