This training mask is built to increase breathing resistance during workouts, adding intensity without changing your routine or environment. Adjustable external levers and internal valves allow airflow to be modified mid-session, making it easy to scale difficulty as effort, pace, or conditions change. The rigid outer shell maintains its shape under heavy breathing, while the contoured inner seal and elastic strap system help keep the mask stable during running, cycling, strength training, and mixed cardio. Designed for repeated use, the mask can be disassembled for cleaning and stored in a compact case between sessions. Many users describe a greater need for breathing control and pacing when training with added resistance. Progression is deliberate. Starting at lower resistance and increasing gradually allows the design to be used consistently over time. Specifications: Material: Neoprene and plastic Dimensions: 6.3" L × 5.9" W × 3.9" H Weight: 0.66 lbs Care: Hand wash with mild soap, air dry completely Usage: Airflow resistance during physical training Sizing: Refer to sizing chart; select size based on body weight