For high-intensity winter training, the Termica Long Salopette L1 stands out as the essential choice. Its latest iteration incorporates an enhanced warming feature, utilizing a smart fiber known as Heat Fiber on the inner surface. Derived from coffee bean processing residue, this innovative fiber attracts far-infrared rays from the surroundings to provide an additional heat-retaining effect. Testing indicates a notable increase of 1 degree Celsius compared to the previous version, ensuring optimal warmth during cold weather workouts.