My son works outside in a park and wears these daily for son protection.  He finds them cooling for long sleeves.  One of the seams on one of the sleeves (we bought 4) is coming loose on one of them, but I can tack that down.  He wants more.  Have also purchased 4 more for my others sons for swimming on vacation.  Not sure how they will hold up in chlorine/salt water but great for the price!  These are thinner, not thick, swimsuit material.  They are also loose fitting.  The sleeves are a bit longer than expected for an average height, but my 6' son finds the fit just right.