The Progress MEGAR TREK men’s T-shirt with long sleeves is made of 100 % merino wool, which has excellent thermoregulation properties. It keeps you warm when you are cold and cools you when you feel hot. It also prevents bad odours and retains its warming properties even when wet. All of the above makes it perfect for year-long wear. Plus, its relaxed fit provides everyday comfort for a wide range of activities including outdoor sports.