Women's Merino 150 Siren Bra
A barely-there merino bra that has become one of the brand's most durable daily staples.
Prices are a snapshot from when this page was built — confirm on the retailer's site.
Story & heritage
The official store labels the Siren Bra the brand's best-selling bra, which gives it a straightforward claim on any Icebreaker icon list. It represents the part of the brand that translates merino away from expedition language and into everyday next-to-skin essentials.
That is why the Siren line matters: it makes the brand's natural-fiber proposition feel less niche and more like a practical wardrobe default.
Materials & craft
Official copy is unusually specific here: the bra uses 150gm jersey corespun fabric with merino fibers wrapped around a nylon core for strength and durability, plus a touch of LYCRA® for stretch. The page also calls out a no-side-seam construction and adjustable elastic straps.
How to choose & style
The Siren is for low-friction layering, not performance theatrics. It disappears best under tees, thin knits and travel layers where bulky bra hardware would spoil the line.
