Can my kayak melt while in the water?

So I have been researching what kayak to buy, and I noticed that one of the websites said it is safe up to 90°.

Does this mean i can't take a kayak out on a day hotter than 90° or simply that I shouldn't leave it outside in direct sunlight outside of the water?

We have tested our boats in temperatures from 30 degrees (Fahrenheit) to baking in the hot sun in the 90’s without any problem whatsoever. All of the latches and plates are made of either 316 stainless steel or steel coated with an enviro-coat which gives the same exposure resistance as the 316 stainless steel.

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