![[Fall/Winter 2025] Down? Synthetic? Fleece? The key to comfortable layering is choosing the right material. The best mid-layers for mountaineering (cold weather gear) by type, and tips for choosing the right one.](https://outdoorgearzine.com/wp-content/uploads/midlayer_best.jpg "[Fall/Winter 2025] Down? Synthetic? Fleece? The key to comfortable layering is choosing the right material. The best mid-layers for mountaineering (cold weather gear) by type, and tips for choosing the right one.")
[Fall/Winter 2025] Down? Synthetic? Fleece? The key to comfortable layering is choosing the right material. The best mid-layers for mountaineering (cold weather gear) by type, and tips for choosing the right one.
Insulation , NORRONA , Rab , THE NORTH FACE , Mountaineering Introduction , to Choose , Recommendations , Patagonia , Mid-Layer , Down , Fleece
Written by Yasushi Hisatomi
![[Fall/Winter 2025] We've selected the best synthetic insulation for fall/winter outdoor activities from approximately 200 models, and here are some tips on how to choose the right one.](https://outdoorgearzine.com/wp-content/uploads/DSC05318-1.jpg "[Fall/Winter 2025] We've selected the best synthetic insulation for fall/winter outdoor activities from approximately 200 models, and here are some tips on how to choose the right one.")
![[Workman's Top Recommendation of the Year] Merinotech Active Insulation Review: Merino wool and graphene open up a new world of warm, breathable clothing for fall and winter activities (Developed in collaboration with Outdoor Gearzine)](https://outdoorgearzine.com/wp-content/uploads/DSC00495.jpg "[Workman's Top Recommendation of the Year] Merinotech Active Insulation Review: Merino wool and graphene open up a new world of warm, breathable clothing for fall and winter activities (Developed in collaboration with Outdoor Gearzine)")
![Why Patagonia's "Nano Puff Jacket & Down Sweater Hoodie" remains an eternal classic, and how to interact with and utilize each of them [Practical Review]](https://outdoorgearzine.com/wp-content/uploads/DSC06311NR.jpg "Why Patagonia's "Nano Puff Jacket & Down Sweater Hoodie" remains an eternal classic, and how to interact with and utilize each of them [Practical Review]")
!["SALOMON MOUNTAIN FLEX HOODED" releases moisture when it moves and traps heat when it stops, and is a dark hose that is a must-see for active insulation this season [Practical Review]](https://outdoorgearzine.com/wp-content/uploads/DSC05154.jpg ""SALOMON MOUNTAIN FLEX HOODED" releases moisture when it moves and traps heat when it stops, and is a dark hose that is a must-see for active insulation this season [Practical Review]")
![The most notable behavioral warming clothing of this season, "Rab Evolute Hoody," brings active insulation to the next stage [Practical Review]](https://outdoorgearzine.com/wp-content/uploads/DSC04914-1.jpg "The most notable behavioral warming clothing of this season, "Rab Evolute Hoody," brings active insulation to the next stage [Practical Review]")
![[A self-paying comparison review without consideration] Lightweight active insulation that hits minimalist hikers when compared to actual wear.](https://outdoorgearzine.com/wp-content/uploads/activeinsul2023_04.jpg "[A self-paying comparison review without consideration] Lightweight active insulation that hits minimalist hikers when compared to actual wear.")
![Rab Generator Alpine Jacket Review: "Top-edge insulation materials" x "The know-how and technology of experts" = Lightweight, compact, warm, and invincible insulation jacket that is resistant to wet](https://outdoorgearzine.com/wp-content/uploads/DSC08048.jpg "Rab Generator Alpine Jacket Review: "Top-edge insulation materials" x "The know-how and technology of experts" = Lightweight, compact, warm, and invincible insulation jacket that is resistant to wet")