Montbell Rime Light IN Flex Hooded Jacket

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Stay warm and mobile with the Mammut Rime Light IN Flex Hooded Jacket—a lightweight, adaptable layer for all your mountain adventures.

Mammut says: 

Delivering the warmth and comfort you need for a wide range of mountain sports, this lightweight hybrid jacket combines all the right fabrics with all the right features. Body-mapped 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 three zippered pockets and a fitted hood to wear under your helmet, 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 Hooded Jacket is a versatile layer that delivers warmth and flexibility. Weighing just 340 grams in a medium size, this hybrid jacket packs a lot of performance into a lightweight package, making it an excellent choice for those who need dependable insulation without the bulk.

One of the standout features of this jacket is its hybrid construction. The combination of body-mapped Loop insulation and Polartec® Power Grid® fleece offers a well-balanced mix of warmth, breathability, and freedom of movement. Whether scaling a steep ridge or layering up for a chilly morning hike, the jacket adapts to your activity level, keeping you comfortable without overheating.

The material feels soft and light, yet thanks to its PFC-free DWR treatment, it’s robust enough to withstand wind and light moisture. The fitted hood, designed to fit under a helmet, adds another layer of practicality for climbers and alpine adventurers. I found the hood snug yet not restrictive, which is ideal when you need to keep your head protected without sacrificing mobility.

In terms of usability, the Rime Light IN Flex impresses with its thoughtful details. The two harness-compatible side pockets are spacious enough for essentials, and the inner pocket is perfect for securing valuables. The jacket can be packed into its own pocket, making it easy to stow away when not in use.

The elastic hem and cuffs ensure a snug fit, preventing cold air from sneaking in. The overall fit is comfortable without being overly tight—great for layering. The jacket’s low packing volume and lightweight design make it an excellent companion for multi-day trips where space is at a premium.

– 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
• Fitted hood can be worn under a helmet
• 2 backpack and climbing-harness-compatible zipper pockets
• Zippered inner pocket
• Elastic hem and cuffs for improved fit
• Small packing volume: Jacket can be stowed in the front right pocket

Specifications

• Small weighs: 329g
• Medium weighs: 340g
• Large weighs: 359g
• XLarge weighs: 372g
• Cut: Regular 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:

• Time-Saver Guide to Choosing a Synthetic Jacket
• Synthetic Insulation Explained
• Recycled Content in Outdoor Gear
• Why is ‘PFC Free’ Important?