The Flatiron 185 1/4 Zip is as solid and dependable as its namesake rock formation in Boulder. Designed for thermo-versatility to zip up for warmth or down to dump heat, the Nuyarn technology really comes through in its ability to offer the highest warmth and moisture management capabilities with a steadfast durability that can't be matched, even at heavier weights.

• Superior Bluesign 185GSM Nuyarn merino offers extra loft for an unmatched warmth-to-weight ratio
• 5x faster drying
• Remarkable long-term durability
• Superfine 18 micron non-mulsed Australian merino Wool for maximum softness and wearability
• Incredible stretch and recovery
• Regular fit offers a modern fit with full coverage
• Engineered seam and eyelet placements for increased mobility and breathability
• No-chafe flatlock seams
• Gusseted Underarms
• Machine Washable
• Hang-Dry Loop
• YKK Zipper