Instruction: Given a question and the related document, predict if the question is answerable based on the information provided in the document. Output only yes or no.

Input:
Question: Do I need to buy a corresponding sleeve as well? If so, which amazon page shows it?
Document: Great for training would rate it better if the sleeve lasted longer, ripped after  3 weeks of use. They need to make it more durable.
If you are military or an athlete who wants to push the limits then you need to buy this superior training tool! I am in the military and this mask shaved off 2 minutes on my run time for the PT test! I ran every day with it on for two and a half months and I&#8217;m still going! I continue to see improvements in my cardio endurance. The mental focus training is great. Before I hated running. Now I look forward to the next challenge!
work like it says that it does and good for working out or just walking around I would buy it again
I returned this & DID NOT get my money back. I am very upset.I will never buy again, ever.
At first, I was skeptical, but after I have trained with it a few times I can see a drastic change in the way I breathe. If you have the money and need to exceed your limits, get it.
It's very well made but I think the same results are possible for less cash.Save money and wrap a towel around your head.
It is a great mask. The only issuse I have is that the sizes are a lil off the medium is fairly big so average people with normal sized head would probably need a small to fit right. Other than thatitbis a great product.
Great piece of equipment. Usually I have some left over energy after my workouts until I started to use this mask. When I put this mask on the last 15 or 20 minutes of my work out it kicks my butt every time.Highly recommend this product.The mask sleeve starts to frail after heavy use. It's not a big deal and that is why I gave it 4 stars.
I was skeptical when I first purchased this item however after a few weeks of use I can notice a significant improvement on my cardio when not using the mask. Well worth the money to help improve a workout that is restricted by a tight schedule.
I am training for some triathlons that I am running this year and bought this to help push me a little farther. Overall, it works great! Restricts my air so that my lungs actually feel like they are getting stronger! My only problem is that the mask doesn't seal really well around my chin due to my beard. I could just shave, but I kinda like my beard...
Answer: no