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: Do these fins float in water, or sink?
Document: Gives me the power in the water I was looking for, is comfortable and easier to carry than larger fins.
Had some problems with the connecting hardware slipping off. Could have lost them if i were in deeper water. Other wise a nice set of fins.
The fins are very well designed, they get you far by pushing a lot of water. The will not get lost as they have a very secure ankle attachment.
good surf fins but strap buckle broke 1st day in the water but manufactor sent me new one per my request
Great fins.Great strap to hold them on in the surf. Comfortable, easy to get into and secure. Stay on and are strong. Quick acceleration. Great for just getting out and enjoying the water. Good for a stronger workout.
I ordered these fins to bodyboard but didn't get a chance to use them in the water. They are completely uncomfortable. The fins begin to bottle neck mid-foot and are tight towards the toes which caused my small toe to fold under my foot. The design is cool looking, but flawed. If the back strap comes off (from the side clips) then your fin is lost.
I must say that I am quite pleased with these fins. I have been using them twice a week for about a month now and they are the right tool for the job. They are great for body surfing; body boarding; and light snorkeling in shallow, calm water and the extra ankle strap is brilliant! I love the neoprene padding on the heel and the foot pocket is soft enough for hours of use.
I looked for months and, for this type of fin, I didn't think I was able to find anything better. My regular use has supported my decision. I only gave the Shredder Surf II fins four stars because they are fairly specific in there usefulness. If you are looking for speed in open water then you are going to want a fin designed more suited for scuba (much more expensive of course).
Nice set of fins: Compact (shorter) for fitting in your gear bag, and great power for moving in the water. The large size was a hair too big for my bare size 10 foot. The medium size works better for me. I dive through ocean surf and use fins for safely being able to go where I want instead of being pulled by the current. These are great surf or snorkeling fins!
These fins are great. I ALWAYS seem to loose a fin when body surfing!These fins have a ankle strap to prevent the fin from coming loose and slipping off.I surf hard and long and always get rubbing areas,(next to the little toe or above the big toe), and the sand doesn't help!I have found wearing a light weight rubber sock works perfect.May look like a tourist walking down to the water ;)  but they are a great guard !
Answer: yes