Woolly Clothing Co Men's Merino Wool Short Sleeve Ultralight Crew (150 GSM) Small Green 100% Merino construction with no synthetic filler to dilute Merino&#039;s natural goodness Athletic fit for layering without bulk Odor resistant for multiple days on the move Lightweight and naturally wrinkle resistant Four season comfort; exceptional warmth to weight ratio in the cold, great wicking and breathability in the heat Naturally flame retardant; campfire safe Cuts and styles fit for the trail, office, gym, or night out Enjoy superior Merino comfort and performance every day, not just trail days Replace your cotton with Merino without breaking the bank Ideal for travel: multi-day wear with no stink, comfort in most climates