Smartwool’s Merino 150 Base Layer Bottoms work hard year-round to keep you comfortable everywhere from the slopes to your campsite. Ultra-smooth Merino helps regulate body temperature, breathes well, and naturally resists odors. What else could you ask for in a base layer? Well, there’s also smooth flatlock seams to help minimize chafing, a wide, fabric covered waistband to fit you just right and a nylon core for added strength.


  • Flatlock seam construction designed to minimize chafing
  • Smartwool's lightest weight Merino jersey fabric uses a nylon core to increase durability while still keeping 100% Merino wool next to skin
  • Fully functional fly
  • Merino-lined, 1.5" (4 cm) wide elastic waistband designed for maximum comfort; 100% Merino next to skin


  • Activity: Multisport
  • Dry Instructions: Delicate/Gentle Cycle
  • Fit: Classic
  • Iron Instructions: Iron Low
  • Lining Fabric Type: Not Applicable
  • Neckline Style: Crew
  • Number of Front Pockets: 0
  • Pocket Closure Type(s): No Pocket Closure
  • Pocket Type(s): No Pocket
  • Primary fabric: 87% Wool
  • Primary Fabric Type: Woven
  • Shirt Closure Style: Pullover
  • Shirt Type: Athletic Shirt
  • Sleeve Length: Short Sleeve
  • Wash Instructions: Delicate/Gentle Cycle