Description Sleek Line Glasses from STIHL give you a modern look that is comfortable to wear and offers rugged protection. Their lightweight, nylon frame is durable and offers several lens color options to choose from. A rubber nosepiece and inserts at the temple provide a pressure-free fit and are designed to help reduce slippage. The protective lenses are made from an optical-grade polycarbonate and filters out 99% of harmful UV rays.