Leo: Premise: "Two bikers taking a break sitting on the grass with their hats on."
Hypothesis: "Two fat bikers taking a break sitting on the grass with their hats on."
Do we know that the hypothesis entailed by the premise?
Mei: OK, So, let's think first...
Me:
Two bikers taking a break does not describe that the bikers are fat.
Thus, the answer is it is not possible to tell.