Smartwool Thermal Merino Mock Neck Women's Size:Extra Small The Reactor Fleece Liner built

The Reactor Fleece Liner built from hollow-core Thermolite® Pro fibres used in a grid-pattern to deliver Sea to Summit's warmest sleeping bag liner and the core of any quality cold weather sleep system

Designed with a detachable neck strap and corner anchor points for versatility

BUILT IN TECH

This fabric's fibres are extracted from naturally grown beech wood

Smartwool Thermal Merino Mock Neck Women's Size:Extra Small The Reactor Fleece Liner builtMeet the Women's Classic Thermal Merino Mock Neck. This 100% Merino wool fan favorite combines the moisture management, temperature regulation, and odor resistance of Merino with the comfort of an interlock knit. Its flatlock seam construction helps prevent chafing, and the regular fit helps give you room to move without additional bulk. Add one of Smartwool's best cold weather base layers to your winter wardrobe and experience the difference the next