What Our Gearhead® Experts Are Saying:"This is my go-to midlayer when I’m climbing or moving fast in the alpine. It’s warm without being bulky, super breathable, and has just enough stretch to keep up with every reach and scramble."When our objectives demand constant motion and our layers need to work as hard as we do, we reach for the Ascendor Light Pull-On Top. Rab’s performance-focused Thermic™ S fleece keeps things light, breathable, and warm—without slowing us down. Alternating loft channels manage airflow while delivering insulation where it counts, making this midlayer ideal for high-output climbing, mountaineering, and alpine missions. Details like a dropped hem, flatlocked seams, and stretchy cuffs make for a comfortable next-to-skin fit, whether we’re wearing it under a harness or shell. The half-zip front offers ventilation when we’re charging uphill, and the Matrix™ chest pocket provides a convenient place for small essentials. From early season ridgelines to summer ascents and cool-weather training laps, the Ascendor Light Pull-On is built for year-round movement in the mountains.