This is the Men's Thermal Speedwork Zip-Neck. It's a great piece for cold weather trail running or Nordic sports. I really like the versatility of this piece. It's a lightweight knit that can accommodate a wide range of temperatures, whether you wear it next to skin or with a base layer underneath. Our Speedwork fabric is smooth and durable on the face and brushed in the interior for great warmth and superior wicking. It's a performance blend of 85% polyester and 15% spandex. And it's treated with polygiene permanent odor control, which is great when your runs outnumber your laundry days. We designed this piece with a snug collar for extra warmth when you need it, and it has a deep zipper for on-the-fly temperature regulation. The zippered chest pocket is great for light essentials like a snack for the trail or your house key. The overlapping thumb holes at the cuffs are cut wide for all-day comfort and provide extra coverage for warmth. Whether you're on a chilly morning run or skate skiing up a steep snowy hill, the Men's Thermal Speedwork Zip-Neck will keep you comfortable when you're covering ground in the cold.