Lightweight, functional, and perfect for active days.- the W SIERRA140 LS with classic crew neck impresses with breathable comfort and a pleasant fit.The especially light SIERRA fabric weight made from ADVANCED WOOL 140 offers excellent moisture management and natural odor resistance.- ideal for intense activities in milder temperatures.Features:ADVANCED WOOL 140 for optimum breathability and wearing comfort.Lightweight and quick-drying merino base layer with natural UV protection.Breathable, odor- and moisture-resistant.Short-sleeve t-shirt with crew neck.Ideal as a base layer for warm winter days and cool summer activities.Base layer.Composition:50% Wool (Merino), 50% Polyester.