Reactor Lightweight Liner Tshirt Each year we hear from

Each year we hear from countless thru-hikers that this rugged sock is the only option that truly takes on the rigors of the trail

it offers a perfect balance of flexibility and support for an enjoyable BC experience

Merino Wool is at home on the trail

this Sutro-inspired design offers style and function for any face size

Reactor Lightweight Liner Tshirt Each year we hear fromOptimized for minimal weight and maximum warmth, the Reactor Lightweight enhances sleep system performance with advanced Thermolite Pro fabric, which uses infrared absorbing ceramic pigments and hollow core fibers to trap body heat. Adding up to 4C 7F of warmth with minimal bulk, its ideal for ultralight expeditions. Stretch knit fabric and articulated arm openings ensure unrestricted mobility. Treated with HeiQ Fresh odor control, its quick drying,