evo.com | Smartwool Long Underwear Bottoms > If you've ever had to cut a great day short because Junior got a bad case of the shivers, it's time to pick up the Smartwool Classic Thermal Merino Base Layer Bottoms. With a super soft and comfy next-to-skin feel, Merino 250 fabric offers breathable warmth for cold days on the mountain and is naturally moisture wicking and odor resistant. Primo warmth to keep the good times going. Merino-Covered Elastic Waistband Fabric Weight | Mid 250 Single layer for cold weather performance. Baselayer for very cold weather. 100% Merino Wool Made with an interlock knit for enhanced comfort, breathability, thermoregulation, and odor resistance. Flatlock Seam Construction Designed to Eliminate Chafing Slim Fit | Kid's Smartwool Classic Thermal Base Layer Bottoms 2026 - X-Large Orange