Designed for the rugged beauty of the Sauk Valley, our Heritage Heavyweight Fleece is the ultimate layer for the active naturalist. This isn't just a sweatshirt; it’s a high-performance comfort piece built for chilly mornings at the riverfront or cozy evenings reviewing field notes. Crafted with premium Airlume combed and ring-spun cotton, this oversized fleece provides a "bold outside and soft inside" experience. The heavyweight 10 oz. fabric and relaxed, unisex fit allow for effortless layering, ensuring you stay "out of your surroundings and into a healthy outdoor life" regardless of the temperature. Premium Specifications: The Comfort Blend: 60% Airlume combed and ring-spun cotton for superior softness (94% for Athletic Heather). Heavyweight Protection: 10 oz./yd.² fabric provides substantial warmth and lasting durability. Modern Naturalist Fit: Features a relaxed, oversized unisex silhouette with slightly dropped sleeves for maximum mobility. Field Ready: Designed to withstand the elements while maintaining a refined, professional aesthetic. Every purchase supports our mission of scientific stewardship and the ongoing preservation of Lowell Park’s historic landscape. Crafted for You, Mindful of the Earth At the Nature Center, we believe in tread-lightly stewardship—not just on the trails, but in our shop. This product is created specifically for you the moment your order is placed. By utilizing on-demand crafting rather than mass production, we significantly reduce overproduction and textile waste. This process takes a few extra days to reach your doorstep, but it ensures that no unnecessary resources are consumed. Thank you for choosing a more sustainable way to shop and for supporting our commitment to a healthier planet. Your patience is a direct contribution to conservation!