RACE-READY LONG SLEEVE BASE LAYER The secret sauce to your next run, the Women's Tecbase Long Sleeve Base Layer is lightweight and form-fitting, meaning you’ll barely notice it under your jersey as you rip down the trail. It feels exactly how it was designed to feel—ultrasoft and second-skin in nature. Constructed from anti-stink fabric, the Women's Tecbase Long Sleeve Base Layer is ready to go wherever you’re going and fast.