ARCITON Men's Professional Compression Tight Pants Base Layer Running Leggings 86%polyester+14%spandex Elastic waist for a snug, comfortable fit Moisture Sensing/Quick time Dry/TWO-WAY Air Circulation Great for skiing, snowboarding, training, competing, and all weather sports and activities Usually, the Asian size is smaller than US about 1 size. For example, the Asian M is often equal to the US S, and our item tag is printed in Asian size only.So you order size US"M", we will send you the item with China label size "L".And so on Thanks!