The Easycover Lens Oak Neoprene for the Sigma 100-400mm f/5-6.3 DG OS HSM lens is crafted from a soft, flexible neoprene material that provides excellent protection while being lightweight. The cover is designed to shield the lens from external elements, including dust, moisture, and scratches, keeping it in pristine condition. The Forest Camouflage design adds a rugged, outdoor aesthetic, making it perfect for photographers who spend time in nature. The cover is easy to put on and remove and does not interfere with the lens's functionality, offering a perfect balance of protection and usability.