Icebreaker Women's Siren Tank Top - Gritstone Heather, Size M

The Icebreaker Siren Tank stands apart from ordinary base layers with its Corespun fabric—merino wool fibers wrapped around a nylon core for added strength without sacrificing next-to-skin softness. This women's tank top delivers the natural performance of ZQ-certified merino in a featherlight 150 gsm knit, making it an indispensable layer for hiking, travel, and everyday active wear.

Highlights

• 83% Merino Wool, 12% Nylon, 5% LYCRA® for stretch and recovery
• Ultralight 150 gsm fabric—breathable and quick-drying
• Corespun technology enhances durability while keeping merino next to skin
• Slim fit with scoop neck and sleeveless design for unrestricted movement
• Naturally odor-resistant and temperature-regulating
• ZQ-certified merino ensures ethical and sustainable sourcing

In daily use

From morning trail runs to long-haul flights, the Siren Tank keeps you comfortable across a wide range of temperatures. Merino wool actively manages moisture and resists odors, so you can wear it multiple times between washes. The slim silhouette layers smoothly under shirts or jackets, while the scoop neck and sleeveless cut offer freedom of movement and a feminine look. The Gritstone Heather colorway adds a subtle, versatile tone that pairs easily with any outdoor wardrobe.

Full specifications

• Product Type: Tank Top
• Gender: Women's
• Material: 83% Merino Wool, 12% Nylon, 5% LYCRA®
• Fabric Weight: 150 Ultralight (150 gsm)
• Fit: Slim
• Layer: Base Layer / Underwear
• Neckline: Scoop Neck
• Sleeve Length: Sleeveless
• Color: Gritstone Heather
• Size: M
• Fabric Technology: Corespun
• Key Features: Breathable, Odor-Resistant, Quick-Drying, Soft, Durable
• Sustainability: ZQ-Certified Merino
• Care Instructions: Machine wash cold (30°C), do not bleach, tumble dry low, cool iron, do not dry clean
• Intended Use: Everyday Wear, Hiking, Travel, Active Lifestyle
• Season: All-Season

Final note

Combining merino's natural performance with enhanced durability, the Icebreaker Siren Tank is a versatile staple for any active woman's wardrobe—ready for adventure, yet refined enough for daily wear.