Wore these in very low temps this past weekend on a winter summit in the Wasatch. The hike itself was fairly steep and temps started around 5deg F. I stayed warm and comfy with these and a thin merino baselayer. Things that I liked the most: The slim fit allows for great movement when you're moving fast, but not so slim that you'll look like you're trying to be hip, nobody wants that. I loved the durable profile around the ankles, even when you're hiking attentively sometimes snags can happen and having peace of mind about the ankle durability is fantastic. The pockets are practical, with great zippers on the hand pockets (which are fleece lined which actually insulates your phone from dieing), plus the drop in stow pocket can keep a map or a snack right on hand to now slow down. Overall great product.