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UNNA Flex Tank is a sleeveless top for running and general training. The model is made from a 50% GOTS-certified organic cotton and 50% GRS-certified recycled polyester blend in a soft jersey knit that balances breathability with a slightly structured hand feel. It has a regular, slightly boxy fit with wide arm openings for natural range of motion, while the straight hem sits at hip length for layering over shorts or pants. A rib knit crew neck supports shape retention around the neckline. On the front, a small reflective transfer logo is centered on the chest, matched by subtle reflective text at the back hem to support visibility in low light. The solid black colorway and minimal branding give the tank a restrained, monochrome appearance.