Rab Sonic Ultra T-Shirt - Women's Bluebird/Light Zinc, XS

What Our Gearhead(R) Experts Are Saying:"This is my go-to tee for hard efforts in warm conditions. It's incredibly light, dumps heat fast, and never feels soggy on steep climbs. The ventilation is noticeable, and the slim fit moves well without chafing, even on long runs."When we're pushing the pace on sun-exposed ridgelines or grinding up steep alpine climbs, the Sonic Ultra T-Shirt is the layer we trust to keep us cool and focused. Built by Rab for mountain runners chasing performance, this ultralight tee responds instantly to changing effort levels and rising temperatures. The Motiv(TM) Aero fabric uses a subtle mesh structure and bulk yarn technology to wick moisture quickly and dry fast, keeping sweat off our skin during intense efforts. Laser-cut vent holes in high-heat zones boost airflow where we need it most, while sweat-mapped construction and smooth seams keep comfort high over long distances. Whether worn solo in the heat or layered for higher elevations, this is a precision-built tee for fast, demanding mountain days.