Smartwool Mens Merino 150 Baselayer Bottom

Size Chart

A year-round favorite, Smartwool's Merino 150 Base Layer Bottoms work hard to keep you comfortable everywhere from the ski hill to the campsite. Ultra-smooth Merino helps regulate body temperature, breathes well, and naturally resists odors. What else do you need in a base layer? How about smooth flatlock seams to help minimize chafing and a wide, fabric-covered waistband. Featuring Core Spun technology, Smartwool wrapped Merino around a nylon core for added durability while still keeping the comfort of ultra-soft Merino next to the skin.


  • Slim Fit
  • Mid Rise
  • Smartwool's lightest weight merino jersey fabric uses a nylon core
  • Fully Functional Fly
  • Merino-lined, 1.5" (4 cm) wide elastic waistband designed for maximum comfort: 100% Merino next to skin
  • Flatlock seam construction designed to minimize chafing
  • Size M inseam: 31 inches (78.5 cm)
  • Garment Weight: 159 g = 5.6 oz
  • Knit in Vietnam: 87% Merino Wool, 13% Nylon Core