Authentic Polartec Gen III grid fleece bottoms in tan—a classic military-grade base layer designed for serious layering and outdoor performance. These thermal bottoms feature the signature grid fleece texture and tapered fit typical of Gen III combat gear. Made from Polartec fleece (98% polyester, 2% spandex) for stretch and durability. Perfect for hikers, outdoor workers, or anyone building a technical layering system. #polartec #thermalwear #baseLayers #tacticalgear #vintageoutdoor