Base layer tops

How to choose a base layer top

Base layer tops are your first layer of defense against the cold and keeping dry on long hikes, shredding backcountry mountains or keeping cozy in your cabin. Constructed with merino wool or a synthetic blend, these tops provide insulation, wick sweat and regulate your temp for enjoying any weather in style.

With light base layers for layering or the thickest wool base layers to keep you cozy in subzero temps, there’s a few features to consider when choosing your new base layer top:

Considering temperature, activity level and any personal preferences towards materials are key when choosing a base layer top (and some base layer bottoms to match).

Material – each material has its own benefits, like quick-drying properties and durability for a synthetic blend or excellent insulation and a natural odor resistance for merino wool.

Weight - Base layers can be lightweight, midweight or heavy weight (tip: MEC base layers are color-coded to help you distinguish which is which), lightweight base layer tops are perfect for high-intensity activity or light layering, and heavyweight base layer tops are geared towards super cold temps where you’re doing low-impact activities and keeping warm.

Other features like breathability, odor resistance and layering compatibility are things to look out for when choosing your new base layer tops from brands like Smartwool, Icebreaker, Patagonia and Kari Traa.