I have never been able to wear wool before as it always made me itch like I rolled around in an anthill. But after discovering Nuyarn from another company in a short sleeve, I decided to give the Wuru long sleeve a try as well. I LOVE IT! I just ran a half marathon in cold temps with this as my baselayer under a poly waffle hoodie. I tend to get cold easily, so laying is always a challenge for me in freezing temps. But it kept me warm even when wet & sweaty, and although my hoodie smelled horrible after the race, my Wuru doesn't have any odor at all and can be worn again without having to be washed every single time which I hope will help it have a very long life. I love the slightly fitted cut & longer length so it doesn't ride up. My only complaint is that the sleeves could be just an inch longer so the thumb holes don't cut into my thumb web so hard. But I am super excited about this top and plan to get another in the future.