Instruction: Answer the given question by extracting information from the supporting document.

Input:
Question: what kind of bottom does the board have
Document: We did a lot of review reading before purchasing this cutting board. It warped within two weeks of having it...the bamboo is in layers, it's not a solid piece from the top (cutting surface) to the bottom. There aren't super great pictures of the side, so this isn't obvious until it arrives. Also, it was never put in the dishwasher, in case you think that's why it warped. Don't waste your money, I wish we hadn't.
Cutting board both attractive and very useful
The order arrived and the board was just as shown in the picture. It has been a welcome addition to our kitchen.
So far this board has met my expectations in quality and durability. I should have bought two of them and given one to my daughter.
I gave this board to my son-in-law as a gift and he is very happy with it. It's sturdy, heavy and just right for the chef of the family.
Bought this cutting board for my wife for Christmas she loves it ! Excellent product for the price would recommend to anyone !
Board has an unpleasant smell upon open but fades in several days. Overall, I am satisfied with the product.
Very, very nice board; I love my board, and I'm certainly enjoying using it....I'm seriously thinking of buying a second board.
This is exactly as described. Easy to clean, no nicks yet. I would recommend this to anyone looking for a nice cutting board for a great price.
This cutting board is wonderful. And the weight of it is perfect. Would recommend to everyone. Also purchased oil to treat it and I think that will help its lifespan
Answer: not really a top or bottom, one side is flat and one side has a groove (as seen in photo)