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: is there a hook on the bottom to attach to the bleachers?
Document: The steel hook on the bottom of the seat ensures that you CAN NOT tip over, no matter how hard you cheer. It's worth every penny.
Great back support, comfortable on the backside, plenty of room, comfortable and nice looking. Rubber bottom on rails helps the chair from sliding and the hook on the front alows one to lean back with complete comfort. Im 6'1&#34; and 235. Highly recommended.
I purchased 2 regular and 2 wide ones of these seats and found the wide ones to be more comfortable. The seat is suspended and you dont hit the hard bench. The folding hook under the seat keeps you from sliding off backwards and is plenty sturdy when you lean back.When I looking at the ads for the chairs I was lookiing for seats with the hook and was dissapointed tha the manufacture does not mention that in the description or show the bottom of the chair.
Great chair. Sits great, keeps you up off the wet bleachers in the rain, the hook keeps your chair from sliding backward too.
I will warn you that these seats are a bit bulky and that they are solid as a rock, so I normally don't bring them unless I know I'll be sitting for more than an hour. By the way, there is a metal hook on the from of the chair that latches to the bleachers, so that you can really lean back without being afraid to all over backwards.
Yes, they were a little heavy, but not terribly so. Unless you are walking long distances, I don't see the weight of the seat being an issue and, when folded, the seat has a nice padded gripping area on the frame.The seat has a hook which folds out to hook under the bleacher seat so you don't need to worry about the seat flipping backward. Best of all, these seats are sooooooo comfortable. They are well constructed and they made our hours seated on bleachers quite tolerable.
The fabric for the seat and the back is made of durable high quality canvas available in plenty of colors. There is a fold away hook for attachment to typical outdoor bleachers as well as thick rubber pads on both runners to provide non-slip seating on fold away gym seating. The back provides the best support of any portable seating I have ever seen, too many others are flimsy and collapse when leaned on. The whole product is very well thought out and manufactured.
I certainly wish I'd had this seat years ago. It's gives great back support and if the bleachers are wet, this seat can go right over the wet spot and still keeps a person nice and dry. I ordered the wide version so i'd have a little extra wiggle room. The seat has a sturdy hook underneath to keep the seat in place so it won't slide. I highly recommend it for anyone looking for a comfortable seat while watching the game or the marching band contest.
Hooks to the stadium stand well. Keeps bottom from getting wet on wet bleachers because the chair is raised. Used the chair all season long and is acceptable at college games.
I finally used my new stadium seat last night at my daughter's first game....it was extremely comfortable. I did not have any back fatigue or soreness in my bottom from the hard metal bleachers. I am looking forward to using it all season.
Answer: yes