What Our Gearhead(R) Experts Are Saying: "I grab the Sonic Hoodie when I want the lightest layer that still gives real coverage. The Motiv Aero fabric breathes insanely well-on steep trail runs it keeps sweat moving so I never feel soggy. The wrap-style hood is perfect for sun or wind, the seams are low bulk, and it moves cleanly thanks to the underarm gussets. It's become a daily driver for fast hikes and ridge days." We pull on the Rab Sonic Hoodie when cool mornings and fast objectives demand a layer that matches our pace. Made with ultralight Motiv Aero fabric, the Sonic actively wicks sweat and breathes with every stride, climb, and high-output push. Its subtle mesh structure boosts airflow, keeping us dry and comfortable when a simple tee isn't enough but a midlayer is too much. A close-fitting wrap-style hood offers extra protection from sun and wind without adding weight, and underarm gussets give us the freedom to reach, scramble, and power uphill without restriction. Low-bulk seams stay smooth against the skin during long days under a pack, while hidden thumb loops keep sleeves anchored through dynamic movement. With odor control that stands up to multi-day missions, the Sonic Hoodie is a versatile baselayer we reach for instinctively on fast-moving mountain days.