Women's Icebreaker Siren Short Sleeve Thermal Base Layer Top - Small

A women's short sleeve base layer top crafted for lightweight warmth and all-day comfort in cool conditions. The Icebreaker Siren SS features a Corespun fabric blend that wraps merino wool around a nylon core for added durability next to skin, while LYCRA® provides stretch and shape retention. Its slim fit and sweetheart neckline create a flattering silhouette that layers smoothly under midlayers or stands alone during high-output activities.

Advantages

The 150 gsm merino-rich jersey naturally regulates temperature, wicks moisture, and resists odour, keeping you fresh from morning commutes to mountain hikes. Flatlock seams eliminate chafing, while the dropped hem adds coverage when you bend or reach. Quick-drying and breathable, this top transitions effortlessly from trail to travel.

Suitable for

• Hiking and trekking in variable weather
• Everyday wear and travel layering
• High-intensity activities like running or cycling
• Cool-weather workouts and outdoor yoga

Key specifications

• Material: 83% Merino Wool, 12% Nylon, 5% LYCRA®
• Fabric weight: 150 gsm lightweight
• Fit: Slim, with sweetheart neckline and short sleeves
• Features: Breathable, odour-resistant, moisture-wicking, quick-drying
• Care: Machine wash cold, line dry in shade

Recommendations

For a reliable base layer that balances warmth, breathability, and next-to-skin softness, the Icebreaker Siren SS is a versatile choice. Pair it with a midlayer for colder days or wear it solo for active pursuits in mild conditions.