100% Merino Wool Heavyweight 1/4 Zip

A heavyweight men'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, hunting, and everyday winter wear.

Designed for cold weather and demanding outdoor activities, it fits comfortably beneath a winter shell while providing enough warmth to wear on its own. The zippered mock neck allows for adjustable ventilation, thumbholes keep the sleeves in place, and the durable Ponte de Roma knit offers warmth and flexibility without relying on synthetic fibers.

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 durable double-knit construction, which provides the warmth and substantial feel of a heavyweight fleece without synthetic fabric. Details like offset shoulder seams, thumbholes, and a protective zipper garage make it especially practical for hiking, skiing, hunting, and working outdoors.

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

• Men's regular fit; runs true to size
• Heavyweight 380 GSM merino wool
• Double-knit Ponte de Roma construction for durability and warmth
• Zipper garage to prevent direct contact between the zipper and skin
• Thumbholes for added hand coverage and secure layering
• Tagless neckline
• UPF 50+ sun protection
• Naturally breathable, moisture-managing, and odor-resistant
• Designed as an insulating midlayer beneath outerwear
• Model is 5'10", 150 lbs, wearing size Medium
• Size Large weighs approximately 15.2 oz (431 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.