The Deviator Half Zip Fleece features bluesign® approved materials, UPF 30 sun protection, and strategic hybrid-mapped construction to create a highly technical layer for trail running, backcountry skiing, or any high-output cool-weather outdoor activity.Engineered with a hybrid-mapped construction, this fleece features a quick-drying, moisture-wicking 100% polyester body for core warmth and a bluesign® approved polyester-spandex blend at the collar, arms and underarms for exceptional movement-mirroring stretch. Deviator's VerticalX™ Octa insulation does not require an interior liner fabric and has an open structure, allowing it to breathe more effectively. It's also 50% lighter than traditional polyester insulation, has an outstanding warmth-to-weight ratio, is superb at wicking moisture, and is soft against the skin. A 13" center front zipper delivers quick, easy ventilation, ergonomic fit thumb holes add coverage and warmth, and a zip chest pocket for securing essentials. Reflective logo details ensure visibility in low-light conditions, and UPF 30 rating shields the sun's UV rays.