Marmot half-zip top made of lightweight and breathable polyester material. The thin material and snug fit won't get in the way. I'm selling it because I haven't had a chance to wear it. It has been opened and doesn't have a bag, but it's unused. - Brand: Marmot - Model Name: TSSWC418 - Size: M - Color: Black - Material: 100% Polyester Thank you for looking.