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 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 from all layers, not just the base. If your mid layer can’t breathe, there’s no point.
Editor's Choice - Patagonia Synchilla
The reference in cozy fleece jackets, Patagonia has created a versatile, featherweight midlayer you can easily wear under you ski shell, or bring to the fire on a cool night out at camp. It is also bluesign-approved for a worry free environmentally friendly option.
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 zips and 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 commence!
MERINO MID LAYERS
While Merino wool is usually thought of as a base layer, it also works well as a mid layer. Brands like icebreaker and Smartwool specialize in Merino and are making more mid layers than ever. Often these are blended with down or synthetic insulation for better heating.
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.
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 for traveling 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 the one garment.
Top Pick - Icebreaker Original Long Sleeve Half Zip
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 and ultra-soft next-to-skin feel and natural odour repellency. It's refined style also makes it perfect for urban adventures.
other top merino wool mid layers
Down Mid layers
Down is natural insulation which retains heat better than most 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 Arc’teryx and Norrøna are renowned for down.
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, but 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 evacuate 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 in down. It provides the warmth you need while your heart rate is relaxed.
Top Pick - Arc'teryx Cerium LT
With 850-fill-power down and a weighing in at light 275g, the Cerium sits among the best in weight to warmth ratio. It is treated with water repellent finish for extra versatility. Consistently a best-seller among the already-impressive line of Arc'teryx jackets.
Other top down mid layers
FLEECE MID LAYERS
A fleece jacket is generally made from synthetic Polar Fleece, the most common type being Polartec polyester fleece. This soft-napped, insulating fabric is warm and soft next to the skin. Garments dry quickly and are durable enough for the most demanding outdoor pursuits. The North Face, Topo Designs and Patagonia are virtually synonymous with cozy 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.
Ideal Use for Fleece Mid Layers
Put a sherpa pullover mid layer on a cozy merino wool base layer and you have the perfect layering for a day on the trails. They’re especially optimal on hiking trips in all conditions because they are quick-drying, moisture-wicking and offer a quality amount of insulation. Because 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 - Norrona Falketind Warmwool2 Stretch Jacket
other top fleece midlayers
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 specific activities.