Product size about : Suitable for adults Product color: As shown in the figure Product material:ABS product features: 1. Train more efficiently with a high-altitude simulation mask that maximizes workout results in less time. By limiting oxygenit encourages deeper breathing, effectively doubling your training output in the same amount of time. 2. Enhance lung capacity and respiratory endurance through controlled breathing resistance. This mask challenges your breathing muscles, helping you build stronger lungs and improve overall stamina for better athletic performance. 3. Designed for athletes of all levels, this fitness mask offers adjustable resistance levels. With two separate airflow customizable valves, it allows users from beginners to professionals to tailor their training intensity. 4. Featuring a comfortable, ergonomic fit, the mask is crafted to suit various face shapes with ease. Its adjustable strap and soft, flexible seal ensure a secure fit and prevent slipping during intense workouts. 5. Presented in a premium gift box, this high-performance makes a thoughtful and unique gift for fitness enthusiasts. Ideal for runners, cyclists, gym-goers, and cardio lovers looking to elevate their training. Precautions: 1. As we all know , the different computers display colors differently, the color of the actual item may vary slightly from the following images. 2. If you feel difficult to choose the size, you can contact us at any time. We will give you some suggestions, but for your reference only. Shipment includes: 1 pc breathing mask