Smartwool Classic Thermal Merino Baselayer Boxed Bottom

What Our Gearhead® Experts Are Saying: "I use these as my go-to cold-weather base layer. The merino blend regulates temperature well and doesn’t get clammy on the skin during high-output days. The slim fit layers cleanly under ski pants or hiking shells, and the waistband stays comfortable on long days outside."Cold mornings at the trailhead and first-chair ski laps call for a layer we can trust. The Classic Thermal Merino Baselayer Boxed Bottom from Smartwool delivers dependable warmth without bulk, keeping us comfortable from alpine starts to fireside evenings.Crafted from a breathable merino wool and nylon blend, these tights naturally regulate temperature while offering durability for repeated wear. The lightweight construction layers easily under shell pants, and the slim fit moves with us whether we’re skinning uphill or trekking through frosty switchbacks. With an elastic waistband and stretch that supports active movement, this is the foundation layer we build our winter systems around.