Mountain Hardwear Stretchdown Light 2027 – Mid Layer Jacket

The Stretchdown Light is Mountain Hardwear's most stripped-down insulating mid-layer — built for athletes who need real warmth without sacrificing movement or pack space. Whether you're racking up at the base of a route, grinding out a mountain approach, or transitioning from trail to city, this jacket is designed to stay out of your way while keeping you warm.

Tipping the scale at just 13.2 oz (373 g), the Stretchdown Light wraps a 750-fill RDS-certified down core in a 20-denier DoppleWeave™ shell (85% nylon, 15% elastane) that stretches four ways and resists abrasion and tearing. The narrow-baffle construction and Cohesion™ insulation interlock lock down in place across every panel, eliminating cold spots without adding bulk. A trim, standard fit layers cleanly over base layers, the center-front draft flap seals out wind, and the whole jacket stows into its own right-hand pocket.

This jacket suits climbers, hikers, and fast-and-light travelers who treat their mid-layer as a performance piece rather than a backup plan. If your layering system needs to compress into a daypack without drama, the Stretchdown Light earns its place. It's equally at home on a dawn-patrol ski approach as it is stuffed into a carry-on.

• Does the down maintain loft when the jacket stretches? Yes — the Cohesion™ interlock anchors down at each baffle join so it lofts fully even when the fabric is under tension.
• Is this jacket waterproof? No — the DoppleWeave™ shell is abrasion- and tear-resistant but is not a waterproof or DWR-treated layer. It's designed to be worn under a shell in wet conditions.