One size fits most (Medium). Typically fits anyone between 100lbs- 275lbs Sports Endurance Fitness Training Mask Kit - Comes with everything you need to start training today, including - Sports Endurance Fitness Training Mask designed to improve High-Endurance and Peak-Performance, 400ml (16oz) pre-workout/protein shaker bottle with metal whisk ball, and soft but durable 23"x13" gym towel. The Sport Endurance Training Fitness Mask is designed to take your training to the next level in any sport. With the built in 4-level air intake valve you can take your workout from 4,000 to 18,000 feet of altitude without taking off the mask. Reduce the amount of training time and get the same results and increase your lung capacity. Level 1- Beginner Simulates 4,000 feet elevation Level 2- Intermediate 6,000 feet elevation Level 3- Experienced 12,000 feet elevation Level 4- Expert 18,000 feet elevation 400ml - 16oz Pre-Workout, Protein Shaker with Metal Whisk Ball : Leak Resistant Cap- Prevents liquids from leaking from the shaker so you can take it with you on the go. Metal Whisk Ball- Helps prevent clumps of protein or your pre/post-workout supplements by breaking them up when shaking them in the shaker. Measurements are embossed on the shaker bottle to help you keep track of your intake BPA FREE Reusable Microwavable Container Strong and durable materials Dimentions: 3.75" wide by 6.25" tall Gym Towel Soft and Durable Dimentions: 23" by 13"
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