I like to hike, and I live in the mountains, so the weather is constantly changing, no matter what season. I bought WoolX Avery knowing I could wear them alone, or under hiking pants, adjusting layers as I hike. I didn’t want to take them off after my first hike with them! They are so comfortable and cuddly soft! I went ahead and bought a second pair!, so niw I can wear one around the house. So snug in winter, and breathable! I am looking at mid and heavy weight base and top layers now, too!