This is my second HH base layer. It is very good for the low price I paid, not sure I'd pay full price. It's fairly warm but very thin so it is easy to layer up in winter, or wear on it's own for running or cycling in cool weather. It wicks away sweat easily so keeps you dry, being synthetic it tends to smell very quickly, so if you're taking it for a ski holiday then you need lots of base layers or be willing to wash it every time you wear it, unlike wool base layers which you can get away with wearing more than once. I'm petite so the sleeves are too long, but that is the norm for me, I've got a way of folding them, and being thin the folded fabric doesn't get in the way or cause a problem getting ski gloves on with all the other layers in between.
These tops are great for skiing or general sports or outdoorsiness where you need to keep warm, but not get sweaty. Because they wick the sweat away, I found I could wear them for several days of my skiing trip without them getting too objectionable.
I use this as an extra layer when running - its breathable and keeps me dry even on my long runs. Also use this as a layer for skiing this season - it was sooo cold at the top of the mountain but it kept me dry and happy all day. Washes well and I love the colour!