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Under Armour ColdGear Authentics Compression Mock ($42, originally $50)

The Under Armour ColdGear Authentics Compression Mock is a great base layer with an overwhelming amount of five-star ratings. The dual-layer silhouette features innovative details like mesh underarm panels for ventilation, which is impressive given its budget-friendly price tag. It's ideal for outdoor workouts like running, or winter sports like skiing. Plus, it comes in a variety of colors as well.