First off, they're super cute. I couldn't pass them up on account of that. They're thinner than some other liners I have and incredibly soft. The only reason I'm taking a star off is because of the fit. They run large, especially in the thumb. I purchased the XS and my hand measurements are: circumference 7.5 inches, length 6.65 inches. I normally wear S or M in gloves due to my palm size. My friend with larger hands, usually wears an L, but sized down to a M since the thumb was also very long on her. The material is stretchy, so both of us didn't have fit issues with the other four fingers.
I have taken these out for runs and hikes in cold weather here in Colorado and they have been fantastic. My hands didn't get too hot or cold during these activities, plus I get tons of compliments! I'd say they're better if your hands run warmer or you use them for high-output activities. Can't wait to use them this ski season in the backcountry!