Last year I bought the arm coolers directly from DeSoto (before TE carried them) after months of (unsuccessfully) looking for warm-weather long-sleeved jerseys. I live in a hot climate so sun protection is a year-round issue for me.

Last month, the arm coolers really came through for me on my first century, which took me from 6:00am 'til 1:30pm. It was a real scorcher. I actually got a little bit of color so yeah, they don't block 100% of UV rays, but then again, most jerseys don't either. Heck... a few months ago I tried a long-sleeved jersey by Cannondale that left me with tan lines from my sports bra after riding only 3 hours.

Other than the arm coolers, the next best thing I've found has been my Louis Garneau TSQ long-sleeved jersey, which is made with LG's Micro Brush fabric. It's not exactly made for hot weather!

So yes, I definitely recommend the arm coolers.

~Cari