Women's Thermal Sweater Icebreaker 260 Tech Long Sleeve Half Zip

On a frigid morning at the ski resort, you pull on this Icebreaker 260 Tech half-zip thermal sweater as your first layer. The 100% merino wool fabric, weighing 260 g/m², immediately traps warmth while wicking away moisture from your skin. The slim fit hugs your body without restricting movement, and the half-zip design lets you vent excess heat as you warm up on the slopes. Flatlock seams and underarm gussets ensure zero chafing during dynamic turns, while the drop-tail hem provides extra coverage when you bend to adjust your boots. This is the warmest base layer in Icebreaker's lineup, built for deep winter and high-output activities.

Key specifications

• Material: 100% Merino Wool (18.9 micron, ZQ-certified)
• Fabric weight: 260 g/m² (midweight, warmest rating)
• Fit: Slim fit with underarm gussets for mobility
• Neckline: Half zip with stand collar
• Sleeve: Long sleeve with drop-tail hem
• Seams: Flatlock to prevent chafing
• Breathability: High, with natural temperature regulation
• Odor resistance: Natural merino property
• Moisture wicking: Excellent
• Care: Machine wash cold (30°C), line dry, do not tumble dry

Why choose it

Merino wool is nature's performance fabric. It adapts to your body temperature, keeping you warm when it's cold and cool when you heat up. Unlike synthetics, it resists odor for days, so you can wear it multiple times between washes. The 260 Tech is Icebreaker's warmest base layer, ideal for skiing, snowboarding, winter hiking, or everyday cold-weather wear. The half-zip adds versatility, allowing quick ventilation without removing the layer. ZQ certification guarantees ethical sourcing and animal welfare.

Ideal use cases

• Base layer for skiing or snowboarding in sub-zero conditions
• Mid-layer for winter hiking or snowshoeing
• Standalone top for cold-weather running or cycling
• Everyday winter wear under a jacket or sweater

Good to know

This thermal sweater is designed for a slim fit; if you prefer a looser layer, consider sizing up. The fabric is naturally breathable and fast-drying, but avoid tumble drying to preserve the wool fibers. With proper care, merino wool garments can last for many seasons. The black color is versatile and hides dirt, making it a practical choice for outdoor adventures.