Mammut Rime Light IN Flex Vest

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For lightweight versatility on the move, this vest is hard to beat.

Mammut says: 

Delivering the warmth and comfort you need for a wide range of mountain sports, this lightweight hybrid vest combines all the right fabrics with all the right features. Thermal insulation meets stretchy fleece for optimal temperature regulation and freedom of movement. Wind and abrasion resistant, it also packs down small and can be stowed in its own pocket. Rounded off with two zippered pockets and a fitted athletic cut for easy layering, it’s a dependable partner for big days outdoors.

All Mammut products purchased within the Europe come with an extended 30-month warranty period. For more details click here.

Our Verdict

The Mammut Rime Light IN Flex Vest balances lightweight warmth with exceptional flexibility, making it an excellent companion for active mountain days. Weighing just 200g in medium, the vest combines breathable Pertex Quantum Air fabric with stretchy Polartec Power Grid fleece. This hybrid construction regulates temperature effectively while allowing complete freedom of movement. The 40g/m² synthetic insulation provides just enough warmth for cool-weather adventures without causing overheating during high-output efforts. The fit is snug yet comfortable, thanks to an elastic hem that holds it securely in place.

Its attention to detail sets it apart: two spacious, harness-compatible zip pockets keep essentials accessible, and the vest packs neatly into its own pocket, making it ideal for minimalist packing. While not a primary choice for extreme cold, its wind resistance and light water repellence add a valuable layer of protection.

The Rime Light IN Flex Vest is a thoughtfully designed, lightweight solution for those who need reliable, adaptable insulation without sacrificing mobility. It’s an easy pick for anyone looking to keep moving in the mountains.

– Reviewed by Ultralight Outdoor Gear

Features

• Hybrid construction with stretch sections for additional freedom of movement and temperature regulation
• Extremely soft, lightweight, wind- and water-repellent material with a PFC-free DWR treatment
• Loopinsulation (40g/m²)
• Lightweight, highly elastic Polartec® Power Grid® fleece with high breathability, excellent moisture management and
• short drying time
• 2 backpack and climbing-harness-compatible zipper pockets
• Elastic hem for better fit
• Small packing volume: Jacket can be stowed in the front right pocket

Specifications

• Small weighs: 190g
• Medium weighs: 200g
• Large weighs: 215g
• XLarge weighs: 227g
• Cut: Athletic Fit

Material & Construction

• Filling 1 – Face Material (B2B): 100% Polyester (recycled)
• Denier (main material): 20Dx20D
• Lining 1 – Face Material (B2B): 100% Polyamide
• Filling (B2B): 40 g/m² Recycled Rope Insulation
• Loopinsulation
• Pertex® Quantum® Air
• Polartec® Power GridTM
• Main Fabric 1 – Face Material (B2B): 100% Polyamide
• Lining 1 (B2B): Pertex® Quantum Air
• Main Fabric 2 – Face Material (B2B): 89% Polyester (recycled), 11% Elastane
• Main Fabric 1 (B2B): Polyamide woven
• Main Fabric 2 (B2B): Polartec® Power Grid™ fleece (186g/m²)

Help & advice:

• Recycled Content in Outdoor Gear
• Why is ‘PFC Free’ Important?