Primium Moisture-Wicking & Cool Undershirts: This 2 pack mens shirts are made of MERINO WOOL & VISCOSE from BAMBOO, which is anti-odor, moisture-wicking, thermoregulating, breathable, ultra-soft, lightweight, perfect for all-season comfort Durable & Perfect Fit: Our mens merino t shirts are extremely durable with its LYCRA Spandes & Coats Sewing Thread, and it's enough elasticity to fit any body shape. This material blend is developed through extensive trials and repeated testing. It delivers excellent sweat absorption, fast moisture wicking, and long-lasting odor resistance, keeping you dry, fresh, and comfortable all day Professional Classic Mens Undershirt: Tag-free design, invisible collar, classic fit, makes more comfortable. And the extra length stays tucked in when you tuck it in. If you prefer a slim fit, please size down All season comfort: Merino Wool Base Layer mens are designed for versatility and varying weather conditions. Perfect for sport, exercise, workout, travel, and daily wear, the temperature-regulating properties of mixed material ensure you stay comfortable in both hot and cold environments Easy Care: Use a laundry bag, machine wash in cold water, lay flat to dry. Pre-shrunk compression stockings resist shrinking and maintain shape through washes MAIN MATERIAL: 30% Merino Wool, 63% Viscose from Bamboo, 5% LYCRA Spandex, 2% Coats Sewing Thread