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This is a wonderful base layer for the whole season. It has nice, soft, breathable fabric, and thoughtful features like a zipper for when you need to go, and thumb holes to keep the sleeves in one place. The greatest feature of this base layer is the hood. It has kept me warm on the coldest of nights skied and stays out of the way when I don't need it up. The only complaints I have is that in areas of high wear, the fabric gets these little string balls things that can get annoying, especially on the cuff, and you cant really use the thumb holes with a jacket that also has thumb holes in the cuff. It is not enough of an issue to make me want to get a different base layer. Also more affordable than other one piece base layers at around $100, I got mine on sale for $70