Women's Siren L/S Sweetheart Top - Black - Small

At just 150 g/m², the Siren L/S Sweetheart Top delivers featherlight warmth without bulk, thanks to its Ultralight Corespun fabric—83% Merino wool wrapped around a nylon core for durability, with 5% LYCRA® for stretch. This long-sleeve base layer keeps you dry and comfortable through high-output days and cool evenings alike.

Overview

The Siren L/S Sweetheart Top is a versatile base layer designed for women who demand performance without compromise. Its sweetheart neckline adds a touch of feminine style, while the drop-tail hem provides extra coverage during dynamic movement. Flatlock seams eliminate chafing, and the natural properties of Merino wool keep you comfortable across a wide range of temperatures and activities.

What stands out

• Ultralight 150 g/m² fabric weight for barely-there layering
• Corespun technology wraps Merino wool around a nylon core for enhanced durability
• LYCRA® stretch ensures a full range of motion and shape retention
• Naturally breathable and odor-resistant, ideal for multi-day wear
• Quick-drying and moisture-wicking to keep you dry during high-output pursuits
• Mulesing-free Merino wool for ethical and sustainable sourcing

Technical details

• Material: 83% Merino wool, 12% Nylon, 5% LYCRA®
• Fit: Slim
• Sleeve length: Long
• Neckline: Sweetheart
• Seams: Flatlock to prevent irritation
• Hem: Drop-tail for added coverage
• Care: Machine wash cold, line dry in shade, do not bleach, do not tumble dry, do not dry clean
• Seasonality: All-season

Our verdict

A premium base layer that blends performance, comfort, and sustainability for the active woman.