The Icebreaker Women's Siren Tank is a merino wool tank top for summertime hikes and naps in the hammock. The soft and stretchy fabric is made from a Corespun blend of merino wool and nylon, with elastane. Designed as an underwear layer, you can layer a tee or long sleeve over top, or just wear it to bed. Regardless of what you're doing, it'll regulate your body temperature year round. Features of the Icebreaker Women's Siren Tank Updated with improved Fit plus corespun fabric for enhanced durability Layers perfectly with Siren Bra Sleek design for everyday comfort and layering Feminine scoop neck Icebreaker tonal screenprint logo