I've been wearing a Halo skullcap since late Spring for sweat control, and let me tell you it works AWESOME!! I wear it down to the low 50's. Below that I use either a lined headband that covers the ears, or a lined skull cap that covers the ears. Once it gets down to the 30's and below I'll go to the balaclava. The one I got from a local outdoor Sportman's store is thin up top, with a thicker fleece area starting at the upper neck and going on down.