Fit and Design Light, comfortable T-shirt in a soft merino wool/recycled polyester blend Combines the thermo-regulating nature of wool with the durability and quick-drying properties of polyester Great first-layer in both warm and cold conditions, and especially useful on multi-day hikes as wool naturally resists bad odors Slightly looser fit gives good air-flow around the body Round neckline Traceable, mulesing-free merino wool 50% Polyester, 50% Wool