Thank you for viewing! Instant purchase without comment is welcome. 【Material】 Nylon 【Size】 Head circumference approximately 49-66cm / Weight 26.5g 【Compatibility】 Unisex free size (adjustable size) This product prevents mouth breathing during sleep and naturally prevents snoring by promoting natural nasal breathing. Cushion mesh material is used for the chin area, providing good breathability and a design that is less prone to stuffiness. The size can be adjusted to fit your head size, so you can use it with a size that fits you.