RACE-READY BASE LAYERThe secret sauce to your next run, the Tecbase Long Sleeve Base Layer is lightweight and formfitting, meaning youll barely notice it under your jersey as you rip down the trail. It feels exactly how it was designed to feelultrasoft and second-skin in nature. Constructed from anti-stink fabric, the Tecbase Long Sleeve Base Layer is ready to go wherever youre going, and fast.