Instruction: Analyze a question and its supporting document. Predicting answerability based on the information provided in the document. Output yes if the document contains relevant information to answer the question, otherwise output no.

Input:
Question: Where is the size chart? I need a pair for my grandson (high school wrestling), do I need to purchase 2? Or is this for a pair? It's difficult to tell
Document: I train often (2-6) times per week so these get used frequently so using them, washing them, and drying (air dry) may lead to wearing them out sooner rather than later. I am happy with purchase though and will continue to use them till they give out.
I can still wear them ... Just some black foam comes off. I am surprised at how both it has worked perfectly and has lasted this long. I'm a 5' tall female weighing around 120 and the small size works best. Please note - they are sold individually. So if you need two - order two!! :)
These are really nice. They don't slip and are not too bulky. I use them for wrestling. My son has a pair and loves them too.
I bought these knee pads after checking some reviews, I use them for BJJ and I can tell you that this are the best knee pads that you can buy. They protect your knee and let you bend your knee to do triangles or apply any of the technics that you want. I tried voleyball knee pads and other pads but they dont let you move as you need.Totally recomended!! !
I have the blue & black versions purchased from Amazon as well. They only come one per pack, so be prepared to purchase two at a time. They are great knee pads. Comfortable and snug without sagging or dropping during training. I use them for BJJ and they take the abuse. These are backups because the first pair are doing well but I am noticing that when I take them off and pull on the neoprene material, I sometimes grab onto the ventilation holes and they will stretch. Eventually, I bet those holes will tear or get bigger.
I practice Brazilian Jiu-Jitsu and when I first started training, my knees were always hurting me. After researching on amazon, I came across these and they are perfect !!! They are worth every penny. I have Zero pain in my knees. I place them in the regular wash and hang them to dry. My first pair is over a 1 1/2 years old and I just bought my second pair about a month ago. First pair still works however the materials in the back of pad started to wear and break off.
I wear these, at minimum, every time I grapple these days.-One pair of McDavid (level 2) knee sleeves with a donut shaped &#34;4-way elastic w/ gel buttress.&#34; I find these great for protection, just not great for grappling. The donut shape of the gel pad tends to &#34;lower&#34; the protrusion of the patella, and gel &#34;donut&#34; protects all the surrounding tissue. But the shape of the gel donut requires somewhat specific positioning and tends to require a lot of relocation while grappling.
Have 3 different knee pads to wear. I pick this one and will wear it until it smells and needs washing.... then when it is washed, I will wear it over hte others first.... This one did not take much time to conform to my knee.... and it is very confortable...High School  Varsity Wresting....
Excellent brace, size does run big (i.e. choose one smaller if you're close on the sizing chart). Not for lateral support though.
I love these knee pads, mine were a little big but they are fine. The next pair I order will be a size smaller, but that being said I love these so much I am going to order them again. I compete in Jiu Jitsu an fight MMA with a 6 day a week practice schedule my body takes a beating and these knee pads feel great when i'm grappling.
Answer: yes