I have not used this product but have used and understand the theory behind thermal protective aids. I am sure the land/shark works very well but I don’t like the way they advertise them for in water use. It almost seems they are advertised to replace a life raft or they may be mistaken as such. In water survival you really want to get out of the water and into a life raft.

Thermal protective aid come in many styles, some are complete suits allowing the user to walk. The warmest and probably the most practical are the bag types that have built in arms and gloves. A thermal protective aid should have a close fitting hood.