ThermoBall 50/50 Insulated Jacket – Men's

Built for high-output days in the mountains, the ThermoBall 50/50 is our pick for athletes who run hot on the ascent but still need real warmth at the top. The 50/50 baffle construction pairs air-permeable panels with ThermoBall Eco synthetic insulation, so heat escapes when you're moving and warmth kicks in the moment you stop. It packs into its own pocket and sheds light moisture with a DWR finish.

• 50/50 baffle construction alternates down-proof baffles with air-permeable 20D x 30D nylon panels to dump heat during hard efforts
• ThermoBall Eco synthetic insulation holds warmth even when damp — no loft loss if you get caught in light rain or sweat through
• Helmet-compatible hood with hidden cord lock adjusts on the fly without fumbling — built for layering under a hardshell
• Stows in the left hand pocket for easy transitions — light enough to carry without noticing it on long days
• DWR finish and secure-zip internal chest pocket round out the feature set for technical alpine and backcountry use