I like the dri-fit heat and cool gear as well. I typically layer a compression shirt under the long sleeve heat gear shirt in an attempt to keep my child dry and warm if its cold. However, that being said that material is mean to wick sweat, not rain. If it's raining hard enough no matter what you put on will soak through. Has anyones used a rain jacket.shirt with a jersey over top? Not sure those would breathe enough and just make your kid sweat more, just a thought at this point.