Quick answer
Start with your usual bra and underwear size in the Merino 150 Siren collection, then wash both pieces in cool water and lay flat to dry. The corespun fabric is soft and stretchy, so fit should feel lightly supportive rather than tight.
Why the Siren Bra feels different from a everyday bra
The Women's Merino 150 Siren Bra uses 150gm jersey corespun fabric, which wraps merino wool fibers around a nylon core. That construction adds strength and durability while keeping the next-to-skin softness merino is known for. A touch of LYCRA® provides active stretch, and the no-side-seam design helps reduce bulk under clothing. Because the fit is lightly supportive rather than compressive, it suits everyday wear and layering better than high-impact workouts.
When merino underwear makes sense for travel
Merino wool naturally resists odors and regulates temperature, which is why many travelers choose it for multi-day trips. The Women's Merino 150 Siren Bikini is soft, stretchy, and has a modern slim fit. However, merino is not a substitute for washing—plan to air it out between wears and wash it when needed. The lightweight 150gm fabric dries relatively quickly, but it is not a quick-dry synthetic, so allow time for air drying.
Fit and care questions answered
How should the Siren Bra fit?
The Siren Bra is designed for a comfortable, lightly supportive fit. It should feel snug but not tight, with the band sitting flat against your ribcage. If you are between sizes, consider sizing up for a more relaxed feel. Check that the band does not dig in or ride up when you raise your arms.
What size Siren Bikini should I choose?
The Siren Bikini has a modern slim fit, so it is meant to sit close to the body. Order your usual underwear size. If you prefer a looser fit, you may want to size up. The waistband should lie flat and not twist.
How do I wash a merino bra?
Wash your Siren Bra in cool water on a gentle cycle or by hand. Use a wool-safe detergent and avoid fabric softeners. Do not wring or twist the bra. Lay it flat to dry away from direct heat. Always check the care label for any specific instructions.
Can I put merino underwear in the dryer?
No. High heat can damage merino fibers and shrink the fabric. Always air-dry merino underwear by laying it flat or hanging it. Keep merino out of the dryer to extend its life.
How often should I wash merino underwear?
Merino resists odors, so you can often wear it more than once between washes if you air it out. Wash it when it starts to feel less fresh or after heavy sweating. Rotate between pairs to give each one time to air out.
Is merino wool itchy?
The Siren collection uses fine merino fibers (150gm) that are soft against the skin. Most people find it comfortable, but sensitivity varies. If you are new to merino, try wearing it for short periods first. Wash before first wear to remove any manufacturing residue.
Can I wear the Siren Bra for exercise?
The Siren Bra provides light support, so it is best for low-impact activities like yoga or walking. For high-impact exercise, choose a sport-specific bra. Match the support level to your activity.
Product facts
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Women's Merino 150 Siren Bra: 150gm jersey corespun fabric with a touch of LYCRA® for active stretch. This gives the bra a soft, lightly supportive feel that moves with you without feeling restrictive.
Women's Merino 150 Siren Bra
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Women's Merino 150 Siren Bikini: Soft and stretchy merino wool underwear with a modern slim fit. The slim fit sits close to the body, so choose your usual size for a smooth layer under clothing.
Women's Merino 150 Siren Bikini
