DreamWear(Latest Version)-2 Packs Headgear Straps Durable Touch-Fasten-ers[Prevent slipping] The curved headgear design fits the head structure better, which prevents slipping at night and improves airtightness, so that your sleep is not disturbed [Sufficient ductility] The elastic material design reduces the sense of restraint, which prevents you from discomfort or tightness and is durable. [High quality Touch Fasten ers] Not only maintains a good fixed effect, but also can be easily adjusted to the tightness you want, and