The early spring race we signed up for isn't going to wait, so our training can't wait, either. That's why STIO made the Fernos Insulated Pant with PeakFill Active insulation, which offers high-performance warmth and breathability for logging miles in the cold heart of winter. The softshell Relance Primeflex material is made with mechanical stretch for full freedom of movement, with articulated knees allowing for a natural stride when we're waking up in the pre-dawn cold.