I carried this kayak and was afraid I would overheat by the time I hit the water. This is a fairly heavy shirt, but it's extremely breathable and waterproof. After several hours of rowing and splashing around, I found that the only parts of my shirt that were in direct contact with my wet bathing suit were wet - the water just pooled in drops everywhere. and fell. It is not very comfortable for normal everyday life, but on the water I did not notice the comfort at all, but I was always surprised by the waterproof coating (although it seems to wear out sooner or later). a little baggy so definitely don't go up a size but I don't think that's enough to justify going down a size, especially as it has a few buttons/attachment points to roll up your sleeves. All in all I think this is a good buy.