AllSaints' Marti tank top might look like a simple, slouchy style from the front, but take a look at the back and you'll notice some of the label's hard-edged aesthetic. Crafted from silky viscose, it's designed with a crocheted openwork design at the back for a sultry peek of skin. EcoVero Viscose (LENZING)/Viscose/Organic Cotton. Colour: black