Base Layer Clothing

With low-profile seams to minimize bulk and maximize comfort, the fitted Women's Summit Series Pro 120 Tights are an adventure-ready, lightweight b...

This mid-weight, duo layer crew, consists of a fully synthetic inside and Merino blend face. Our bi-layer construction, creates an air pocket in-be...

The Cloud Nine Performance Tight is the ideal piece for all day warmth and comfort while being out in the elements. This versatile piece features a...

The Cloud Nine Scoop Neck Top is the ideal piece for all day warmth and comfort while being out in the elements. This versatile piece features an u...

The Thermolator Pant is the ideal piece for all day warmth and comfort while being out in the elements. This versatile piece features an ultra-soft...

The Thermolator 2.0 Crew Neck Top is the ideal piece for all day warmth and comfort while being out in the elements. This versatile piece features ...

A thin base layer with ultimate warmth - the Heatwave reversible top harnesses the amazing warming power of Seirus exclusive Heatwave technology. T...

Our most versatile baselayer: warm, breathable, quick-drying and with HeiQ Fresh durable odor control for daily use. The Capilene Midweight Bottoms...

Our most versatile baselayer: warm, breathable, quick-drying and with HeiQ Fresh durable odor control for daily use. The Capilene Midweight Crew hi...

Our most versatile baselayer: warm, breathable, quick-drying and with HeiQ Fresh durable odor control for daily use. The Capilene Midweight Zip-Nec...

With its innovative, seamless, 3-D knit structure, our Capilene Air Crew offers amazing warmth and comfort range. An airy blend of 51% responsibly ...

From trekking across Thailand to traversing the toughest stretches of Baja, we've spent over 20 years perfecting the art of adventure - and underwe...

From trekking across Thailand to traversing the toughest stretches of Baja, we've spent over 20 years perfecting the art of adventure - and underwe...

From trekking across Thailand to traversing the toughest stretches of Baja, we've spent over 20 years perfecting the art of adventure-and underwear...

From trekking across Thailand to traversing the toughest stretches of Baja, we've spent over 20 years perfecting the art of adventure - and underwe...