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IMO not a noticeable cooling as compared to carpet but there is a small difference. The biggest difference for me was not stepping on the snaps of the carpet that have been baking in the sun. Those used to hurt. Once there has been significant traffic in and out of the water the SeaDek does a great job at cooling down and also drying quickly. Buy it and don't look back.
I have two seasons on my storm grey seadek and I've never had an uncomfortable temperature on mine. I am in Minnesota but we do get some 90 degree days. This is the best mod I've done, it makes the boat look so good and it eliminates the need to dry out carpet.