WHAT IT IS / PRODUCT FEATURESThe sleeveless version helps cool down your indoor rides when you're really going above and beyond. Lightweight 3D mesh 93% polyester / 7% elastane wicks moisture and dries quickly.HEIQ Fresh Tech treatment with silver, for odor reduction.Semi-open mesh fabric allows maximum airflow without being too see-through.1 Small back pocket.Color: 611 dark red, 414 dark blueSizes: XS - 3XLWeight: 52g. (M)Temperature range: 20 - 40°C Material Composition:93%polyester 7%elastane We made this sleeveless top to actually keep you cooler than if you were wearing nothing at all. It works because it disperses sweat over a larger area to aid cooling by evaporation. Of course, this won't make you sweat, but it will keep you more comfortable. It's deliberately simple and is cut close to the body and has a small pocket at the back. Finally, it's HEIQ Fresh Tech's natural anti-odor treatment prevents odors from building up in your clothing.