Explore the Collections


Classic All-Season

Warm to cool weather activities

  • Slim fit
  • Lightweight: 150g/m
  • Worn alone on warm days. A layering foundation on cooler days.

Classic Thermal

Made for cool to cold weather outdoor activities

  • Slim Fit
  • Midweight: 250g/m
  • Versatile use for colder seasons

Intraknit™ Thermal

High-energy activities in cool to cold weather.

  • Slim Fit
  • Midweight
  • Designed for warmth and an enhanced performance

Intraknit™ Active

Year-round high-aerobic activities

  • Slim fit
  • Midweight
  • Features the natural cooling properties of TENCEL™ fibers

Classic Thermal Merino Kids

Made for cool to cold weather outdoor activities

  • Slim Fit
  • Midweight
  • Versatile for range of activities



Made to help you stay comfortable, confident,

and outside longer doing what you love.

Gear up to go farther.


No matter how you get outside, it’s easy to find your best Merino wool base layer for you with Smartwool.

Whether you need a lightweight Merino wool base layer for year-round adventures or

our warmest Smartwool® base layer for every winter outing, we have the comfort you need to go farther.

Shop women’s Smartwool® base layers, men’s Smartwool® base layers, and the entire Smartwool® Intraknit™

base layer collection today and explore forever.