Before I left for a recent 4 day trip to the Adirondacks I purchased a dryWear (CoolMax clone) long sleeve T shirt to use with my light weight, synthetic running shorts as a base layer under my gear (vented four season type jacket and pants). The stuff is vastly superior to a cotton T and cotton underwear I would typically wear under my gear for touring. When your sweating it pulls the moisture away from your skin, so you don't feel damp and clammy. It allows the moisture to still evaporate and cool though. Also if you decide to take a break and remove your gear your still presentable enough to be out in public. The shorts also make an interesting fashion statement when accessorized with riding boots . The runners shorts also double as swim shorts if you are touring. I rode through a few heavy rain showers (without the water proof liners installed - doh!) and highs of 34C. While I got soaked in the rain, the stuff kept me comfortable and started to dry almost immediately when the rain stopped. Also more cool than cotton in the heat under my gear. Recommend!