Leo: Premise: "A man donning an orange helmet is climbing up a white glacier."
Hypothesis: "A man is using a harness and carabiners to climb a glacier."
Do we know that the hypothesis entailed by the premise?
Mei: OK, So, let's think first...
Me:
There are other ways to climb a glacier other than using a harness and carabiners.
Thus, the answer is it is not possible to tell.