MTHD Merino Mid Weight Long Underwear Bottoms L1

$ 37.99 $ 74.99
Color: Burnt Olive

MTHD L1- Next-to-skin Base Layer

The Mid-weight Merino Long Underwear will keep you comfortable for days traveling the open trails or hunkered down at base camp. A flip-top fly allows easy access when nature calls, and an interior back waistband elastic print will helps keep these bottoms in place. Generous leg length allows the pants to meet your ankles and tuck into socks as needed. Satisfaction guaranteed. 

Built from an ultra-fine Merino, our L1 base layer styles are the perfect next-to-skin apparel to start your layering system. Whatever you’re doing, and wherever you are, Merino is naturally water repellent, odor resistant and stretchy. It’s also high wicking and feels “breathable”, all while keeping you insulated, even when wet. As for dealing with extreme temperatures, Merino sheep are bred to survive scorching summers and freezing winters. Their fleece has evolved to stay cool in temperatures as high as 86°F, or stay warm in temperatures as low as 14°F. Depending on your own body temperature and the humidity of your skin, Merino fibers in clothing respond and adapt to the conditions by either trapping or releasing heat just like they do on the sheep. Looks like millions of years of evolution from a bunch of woolly mammals has its merits!


Materials: 100% Certified Merino Wool from Australia, 18.5 microns, 230 g/m2 


  • Sustainably Sourced Natural Fiber
  • Low Bulk Merrowed Seams
  • Moisture Wicking
  • Anti-Microbial
  • Naturally FR
  • Flip-up Fly Opening
  • Crotch Gusset
  • Wrap-around Side Body Panels
  • Ankle Leg Length
  • Grippy Interior Back Waistband
  • Super-soft Sueded Wrap Label
  • Reflective Thigh Logo
  • Weight by Size: S: 6.6oz M: 7.5oz L: 8oz XL: 8.4oz 2XL: 9oz


    MTHD = Mountain | Tundra | H2O | Desert