Fleece half-zip top, perfect for the outdoors with a blue and black color scheme. - Brand: neak peak - Size: L Length 68cm Width 53cm - Color: Blue/Black - Design: Half-zip - Material: Fleece As shown in the photos, it appears to use Heat Self technology. I don't know the details. neak peak is a European outdoor brand, so this shirt has long sleeves and a slim fit. Purchased new and never used. Only tried on. Thank you for looking.