"What Our Gearhead® Experts Are Saying:""This is my go-to for cold runs and shoulder-season training. It fits like a shirt but adds just enough thermal protection and wind resistance on the front. Super breathable, and it layers clean under a shell if the weather turns.""Whether we’re logging frosty morning trail miles or heading out for a late-season summit push, the CONCURVE Thermo Hybrid Jacket keeps us warm without holding us back. Crafted with recycled thermal stretch fabric and a form-fitting profile, this active-ready layer moves like a shirt but protects like a light jacket. Its wind-resistant front panel shields our core from biting gusts, while the full-zip front and breathable back panel keep things ventilated when we start to heat up. Two hand pockets stash essentials, and reflective details boost visibility for early morning or evening efforts. On its own or beneath a hardshell, it’s an essential piece for cold-weather pursuits."