EVERYDAY PERFORMANCE: With a fabric weight of 170 GSM, this lightweight active base layer set is built for breathable performance. It’s a sleek, streamlined alternative to our heavyweight winter fleece thermal set - ideal for active days, transitional weather, or year-round wear. Soft on the inside and smooth on the outside for comfort that works overtime. MADE TO MOVE: Designed with a close-to-the-body fit and stretchy fabric, this two-piece set includes a long sleeve crewneck shirt and leggings with a functional fly for everyday convenience. Lightweight and flexible, it keeps up whether you're on the go or kicking back. READY FOR ANYTHING: Moisture-wicking and odor resistant, this set helps you stay dry and fresh throughout the day. Great for layering under scrubs or uniforms, it also works under workout wear, hiking gear, or casual clothes - making it a versatile year-round essential for home, travel, or active days outdoors. ALL-DAY COMFORT: Built for ease, this set features a soft interior, smooth exterior, UV protection, and a tag-free design for irritation-free wear. Layers easily under outerwear without bunching or bulk. LIVE IN LAYERS, EVERYDAY: For over 50 years, Cuddl Duds has delivered smart, reliable layers made for real life. Explore our full men’s collection - from base layer sets to sleepwear, lounge tops, and scrubs - designed to keep you warm, dry, and comfortable every day of the week. The Cuddl Duds Men’s Lightweight Active Base Layer Set is designed for motion, comfort, and year-round layering. This men’s base layer set is breathable, flexible, and made to keep you dry and fresh - whether you're commuting, hiking, working indoors, or relaxing at home. This 2-piece moisture-wicking thermal set includes a long-sleeve crewneck top and leggings with a functional fly, crafted from soft, 4-way stretch fabric that moves with you. The brushed interior delivers cozy next-to-skin comfort, while the smooth exterior makes it easy to wear under clothing. Built-in UV protection, and a tag-free design make it a perfect fit for everyday routines, light workouts, travel, or layering under scrubs and uniforms. Whether you’re dressing for fall, spring, or a mild winter, this lightweight thermal underwear set for men is a reliable go-to that layers well, feels great, and works as hard as you do.