100% Merino Wool Heavyweight 1/4 Zip Top

A heavyweight women's quarter-zip pullover made from 100% merino wool, without the polyester or synthetic fleece found in most outdoor midlayers. The Minus33 Wilderness Quarter-Zip features a substantial 380 GSM double-knit merino wool fabric, providing natural insulation, breathability, and temperature regulation for skiing, snowboarding, hiking, and everyday winter wear.

Designed to fit comfortably beneath a winter shell, it features a zippered mock neck for adjustable ventilation, thumbholes for easy layering, and a chest pocket. The durable Ponte de Roma knit offers warmth and structure while remaining soft, flexible, and comfortable enough to wear beyond the mountains.

Materials

100% merino wool that is OEKO-TEX® STANDARD 100 certified and Woolmark® quality standard.

380 GSM heavyweight Ponte de Roma double-knit fabric with 21-micron fibers.

Australian-sourced wool.

Why we chose it

Finding a genuinely warm, heavyweight outdoor midlayer made entirely from natural fibers is difficult. Most technical quarter-zips and fleece pullovers rely on polyester, nylon, or other synthetic blends. The Wilderness Quarter-Zip uses 100% merino wool fabric instead, offering natural insulation, moisture management, breathability, and odor resistance.

We especially appreciate the double-knit construction, which creates a substantial, durable fabric without synthetic fleece. The offset shoulder seams, thumbholes, and protective zipper garage are practical details that make this piece well suited for layering during outdoor activities.

Minus33's OEKO-TEX® STANDARD 100 certification means the garment has been tested for over 1,000 harmful substances, including PFAS. The brand also meets Woolmark quality standards and states that its garments are made without intentionally added PFAS.

Fit + details

• Women's regular fit; runs true to size
• Heavyweight 380 GSM merino wool
• Quarter-zip mock neckline for adjustable ventilation
• Zipper garage to protect skin from contact with the zipper
• One chest pocket
• Thumbholes for added hand coverage and secure layering
• Offset shoulder seams for comfort beneath backpack straps
• Tagless neckline
• UPF 50+ sun protection
• Size Medium weighs approximately 12 oz (340 g)

Care

Turn inside out and machine wash cold on a gentle cycle with like colors, using a mild or wool-specific detergent. Tumble dry low and avoid bleach or fabric softener. Store in an airtight container when putting away for extended periods.