Big Bill base layer tops are designed to keep you warm, dry, and comfortable when temperatures drop and the work keeps coming. With two levels of warmth and reliable sweat-wicking performance, our lightweight tops offer everyday comfort while our midweight gridded fleece quarter-zip delivers extra insulation without added bulk. Soft, breathable fabrics and tagless labels ensure all-day comfort, because nobody wants a scratchy tag rubbing at their neck. For full lower-body protection, our long johns come in lightweight and midweight options built to hold in heat, move easily under your gear, and manage moisture through long, demanding days. Whether you're layering for cool mornings or bracing for freezing conditions, Big Bill base layers give you dependable warmth and comfort from top to bottom.