The Indera 2 Layer Hydropur Performance Thermal Shirt is the ultimate high-performance thermal shirt. This 9 oz heavyweight thermal shirt is constructed of a HydroPur/Poly/Merino Wool blend (100% Hydropur liner, 70% polyester, 30% Merino Wool shell) and is ideal for extreme cold temperatures and mid to high exertion activities. The fleeced Hydropur liner works aggressively to wick excess internal moisture away from your skin, keeping you dry and warm and provides antimicrobial protection to keep you fresh and smelling good. Scent-blocking fibers also help keep your scent under control, while the extended shirt tail allows for easy tuck-in. The tagless design keeps annoying tags from ruining your time outside, while the rib cuffs provide durability and secure fitting.