I'll give it a shot:
"Super waterproof rainsuit for non-aerobic activities....
Fabric: Hard Shell 100% waterproof PVC with 100% nylon backing and 100% polyester mesh vents."
Looks like a lightweight running suit. Might be OK for WALKING in the rain.
On the deck of a sailboat in a storm, you are likely to be doing dome heavy aerobics staying on deck, cranking on winches, and going up & down the companionway. This rainsuit would probably last me about 30 min. in a storm...YMMV
Looking at my raingear the pants are made from 100% Nylon (real heavy thread) with a polyurethane coating on the shell, lined with Nylon taffeta (which looks like the above suit material), and Polyester mesh.
What is it worth to you to be dry in a storm at sea?