Description of Marmot Reactor Jacket - Boy's A classic, lightweight Polartec® micro fleece jacket for all-weather comfort. It functions perfectly as a light jacket in spring or fall, or as an excellent mid-layer in winter. Flatlock construction eliminates irritating seams for easy layering. Features: Main Material: Polartec® Classic 100 Micro P-460 Designed to Fit Over a Light Layer Flat Lock Construction Polartec® Classic 100 Micro Polartec Classic 100 Micro Wind Flap Behind Front Zipper Protects Against Drafts Zippered Handwarmer Pockets Soft Fabric to Warm Hands