I can't speak highly enough of Minus 33's 100% merino wool clothing! After scouring hundreds of online reviews, I purchased this Minus33 Women's 'Sequoia' Merino Wool Mid-weight Zip Neck Base Layer Top in black with the intention of thru-hiking the Appalachian Trail. This turned out to be my Sleeping In Shirt when nights were below freezing and my Wear In Town Shirt because it looks so darned nice. Unless you try it, you just won't be able to believe how lovely this shirt is! The knit is fine and smooth and only barely feels like a sweater. It's so soft; not a single itch or scratch! What they say about Merino wool is true ... it does not hold body stink like synthetics do! The seams are all well made and comfortable. Never had any problems with the zipper. The sleeves are slightly on the long side but then I'm short and the sleeves served well to pull down over my hands somewhat when I didn't quite need gloves. This is NOT a heavy shirt! It's supremely lightweight. Machine wash and dry, too! (I was always sure to never dry hot) AND they have really big sizes! Just can't say enough good things about it! This is a hands down winner for me. It's going to last me forever, too!