It’s always best to know how to layer for outdoor activities. Having an idea of the weather and the demands of the activities you’ll be doing will make choosing those layers, including the outer layer, simple. But mid layers—like fleece vs. down vs. merino wool—aren’t just for the mountains. You can wear them all fall and winter long.
While a base layer is the root of a good layering system, choosing the best mid-layer is just as important. High-output activities that make you sweat need moisture-wicking components from all layers, not just the base. If your mid layer can’t breathe, there’s no point.
Editor's Choice - Patagonia Synchilla Snap-T Pullover
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The gold standard in cosy fleece jackets, Patagonia has created a versatile, featherweight mid layer you can easily wear under your ski shell, or bring to the fire on a cool night out at camp.
The Synchilla Snap-T Lightweight Pullover is also bluesign-approved, making it a worry-free environmentally-friendly option. It's not the most breathable option: Consider wearing it on colder days, over a merino base layer, or on its own for a camping party—it's the perfect campfire companion.
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Fleece vs. Down vs. Merino Wool Mid layers
The three most common types of mid layers found in an outdoor enthusiast’s wardrobe are down-insulated, Merino wool, and fleece. We know them all, from puffy down jackets to comfy fleece vests to sleek Merino mid layers. Each has unique features and benefits—so how do you pick which one is right for your activity? Let the fleece vs. down vs. Merino wool battle begin!
Performance comparison
When it comes to performance, both fleece and wool have their own strengths and weaknesses. Fleece is renowned for its excellent moisture-wicking properties, making it an ideal choice for high-intensity activities where sweat management is crucial. However, it’s worth noting that fleece can lose some of its insulating properties when wet, which might be a drawback in damp conditions.
On the other hand, wool, particularly Merino wool, is a natural insulator that excels at retaining heat even when wet. This makes it a reliable option for activities in variable weather conditions. Wool fibers allow for superior insulation and breathability, ensuring that you stay warm without overheating. However, wool garments can be heavier and more expensive compared to their fleece counterparts.
In terms of breathability, wool generally outperforms fleece. The natural fibers in wool facilitate better airflow and moisture transfer, making it a great choice for activities that involve a lot of sweating. Fleece, while breathable, can sometimes lead to overheating if not properly ventilated. Therefore, when choosing between both fleece and wool, consider the specific demands of your activity and the weather conditions you’ll be facing.
MERINO MID-LAYERS
While Merino wool, a natural fiber, is usually thought of as a base layer, it also works well as a mid layer. Brands like icebreaker and Smartwool specialise in Merino and are making more mid layers than ever. Often these are blended with down or synthetic insulation for better heating, durability, and stretch.
Merino wool is known for its anti-odour properties, durability, and minimal washing. A Merino mid layer is a wise idea on an expedition with few opportunities to clean your gear. This versatility allows you to pack lighter because of how much use you can get out of a single merino garment.
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Ideal Use for Merino Wool Mid Layers
Unlike fleece and down, Merino wool mid layers are usually heavier and become even heavier when wet. For this reason, a Merino wool mid layer is beneficial for short hiking trips, backpacking, or travelling adventures. Due to their ability to regulate body temperatures in a variety of weather, these mid layers are great if versatility is a necessity.
If you are embarking on a more casual multi-day expedition with limited space, a Merino wool mid layer is a smart choice because of its anti-odour properties. You won’t have to worry about smelling funky after one day of exercise, and you’ll stay sufficiently warm while needing only one garment.
Top Pick - Icebreaker Original Long Sleeve Half Zip
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Icebreaker continues to lead the way in all things Merino. This mid layer offers an incredibly breathable insulation which helps regulate body temperature during high output activities. It benefits from all the properties of Merino which also includes an ultra-soft next-to-skin feel and natural odour repellency. Its refined style also makes it perfect for urban adventures.
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other top merino wool mid-layers
Down Mid layers and best mid layers for skiing
Down is a natural insulation which retains heat better than comparable materials. Used in jackets and parkas, it offers outdoor enthusiasts supreme warmth. As an insulator, nothing beats it—but you don’t need down for every type of activity.
Wet or damp conditions aren’t friendly to down. Dry climates are where down-filled mid layers shine brightest—or warmest, in this case. Brands like Rab and Norrøna are renowned for their down.
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Ideal Use for Down-Insulated Mid layers
Down mid layers are ideal for use in icy and dry conditions. They work well as stand-alone layers in dry climates before temperatures plummet. It isn’t nearly as breathable as fleece, down is more suited to lower output aerobic activities when some insulation is necessary.
Wearing a down mid-layer isn’t ideal for anaerobic activities such as ski touring or running—it doesn’t expel moisture as quickly as other options. It is the perfect layer to put on while stopping for lunch when out mid-winter ski touring. The extra body heat from exercising will stay trapped inside. Stroll around the city or take the dog for a walk at your cottage wearing down, it provides the warmth you need while your heart rate is relaxed.
Top Pick - Best mid layer for skiing
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The Rab classic. Lightweight, made from recycled materials and remarkably compact, the Microlight Alpine Jacket is one of our best sellers—with good reason. Ultrapolyvalent, it fits under a waterproof shell for winter hiking, alpine skiing, or touring. Tear-resistant and water-repellent, it can also be worn alone when the wind is not blowing too hard. Its 700-fill factor down makes it a must-have for all the winters to come.
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Other top down mid layers
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- 800 RDS-certified down
- Water-resistant finish
- Outer materials made of recycled polyester
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- 800 water-resistant down
- Fluorocarbon free DWR-treated down
- Outer material is Pertex
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- 800 RDS-certified down
- Water-resistant finish
- Outer materials made of recycled polyester
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- 800 water-resistant down
- Fluorocarbon free DWR-treated down
- Outer material is Pertex
FLEECE MID-LAYERS
A fleece garment is generally made from synthetic Polar Fleece, is the most common type being Polartec polyester fleece. This soft-napped, insulating fabric is warm and soft next to the skin. Synthetic fleece, made from materials like polyester, is known for its superior wicking properties and affordability. Garments dry quickly and are durable enough for the most demanding outdoor pursuits. The North Face, Topo Designs, and Patagonia are virtually synonymous with cosy fleece mid layers.
Although fleece is not usually ideal for wet and windy conditions (excluding Windstopper Fleece in The North Face fleece jackets), they are exceptionally breathable and have excellent moisture-managing properties. This makes them a near-perfect layering piece. They may be less compressible than a softshell or down mid layer but will provide warmth all day even when wet.
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Ideal Use for Fleece Mid Layers
Put a sherpa pullover mid layer on over a cosy merino wool base layer and you have the perfect layering for a day on the trails. While a fleece mid layer is quick-drying and moisture-wicking, a wool layer offers superior warmth and protection against the elements. They’re especially optimal on hiking trips in all conditions because they are quick-drying, moisture-wicking, and offer a quality amount of insulation.
Since fleece garments and fleece-lined jackets are generally available in different weights, you can find the perfect one to trap your body heat while exploring the outdoors.
Top Pick - Better sweater Jacket
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A timeless classic, the Patagonia Better Sweater features a knit-like outer surface and a soft fleece interior. Made from recycled heathered polyester fibres, this jacket is dyed using an environmentally friendly technique that significantly reduces the consumption of dyes, energy, and water compared to conventional methods. The Better Sweater is also Fair Trade certified.
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other top fleece mid layers
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100% polyester Polartec
OEKO-TEX® STANDARD 100 certified fabric
Bluesign-certified fabric
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- Left-chest pocket for easy stashing of small items, minimal bulk makes for a great layering piece
- Off-shoulder seams sit comfortably under pack straps
- Recycled polyester
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Lightweight 96% recycled polyester
200-weight classic - airy, warm
Reverse coil front zipper
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100% polyester Polartec
OEKO-TEX® STANDARD 100 certified fabric
Bluesign-certified fabric
Product Name
- Left-chest pocket for easy stashing of small items, minimal bulk makes for a great layering piece
- Off-shoulder seams sit comfortably under pack straps
- Recycled polyester
Product Name
Lightweight 96% recycled polyester
200-weight classic - airy, warm
Reverse coil front zipper
Mid Layer Face-Off Conclusions
Everyone will have a fleece vs. down. vs. Merino wool mid layer preference depending on their own experiences, preference of feel and weight, and the activities they are doing.
For those new to the process of layering for outdoor activities, the suggested breakdown above will help you dress appropriately. Over time, you may find certain mid layers work better than others for your endeavours, or you may find that you prefer down, fleece, and Merino wool mid layers for different purposes.
But whatever you decide, Altitude Sports has got you covered.
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