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Men's Baselayer Tops
Whether you're looking for foundational warmth, lightweight performance, or both, men's baselayer tops from Columbia Sportswear have you covered. The next-generation version of long underwear, these layers are built for protection, performance, and comfort while you're active outdoors in all kinds of weather.

From skiing and hunting to hiking and running, these fitted styles complement your outerwear with core warmth and comfort. And with a variety of sizes, styles, and features (like thermal-reflective, sweat-wicking, comfort stretch fabric) to choose from, our selection of versatile and durable base layers deliver year-round.