The RW Takeaway: The men’s UA Rush Compression top kept us cool and energized—but we’re still not sure if it’s because of Celliant fabric tech or the placebo effect. Energy return has been the focus of the latest arms race in the shoe market, with offerings like the Nike Next% and the Reebok Floatride Run attracting runners with lightweight, performance-driven designs. With the UA Rush Compression Sleeveless, the Baltimore-based company is calling upon their long history in the compression game to bring the energy return close to their chest—and abs and back. (We also covered the women’s Rush tank, a loose-fitting, open-back top, which pairs well with the Rush bra.) The new tech, developed by Celliant, claims to capture and redistribute energy burned during activity. As the body emits heat, mineral-infused fibers in the shirt capture said heat as infrared energy, which is then reflected back into the body. (It’s much better explained in this video). Layman’s terms: the shirt is designed to increase your stamina during each workout, which it does to varying degrees. The Rush does a decent job at ventilating and absorbing sweat, thanks in part to a V-shaped column of mesh panels ...