Neoprene Imported SIMULATE HIGH-ALTITUDE TRAINING: Boost your lung capacity, improve your stamina, and break through your limits with our workout mask CHOOSE YOUR INTENSITY LEVEL: Personalize your training with 24 resistance levels designed for beginners to pros FITS COMFORTABLY: Our universal fit sleeve and anatomical grip mask make this exercise mask fully functional without compromising comfort EASY TO CLEAN: Use our included cleaning spray and cloth to maintain hygiene after each workout BUILT TO LAST: Our gym mask is made of ultra-durable ABS plastic and comes with a zipper case for easy storage and transport Note: 1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. 2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you! About Shipping: 1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly. 2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances. 3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 216 hours Hope you have a pleasant shopping experience!