Colorful lens: multi-layer coating, mixing colorful, extremely cool. With excellent UV protection. Suitable for all weather. Black(gray) lens: can block reflected light from smooth surface and 99% of harmful light. One of the essential colors. Transparent lens: hard impact resistance with excellent...

This mariner's guide to the weather provides information on weather warnings and fronts, the Beaufort Scale, cloud formations, fog, storms, wind, waves and swells, barometer use, and simple forecasting methods in one easy-to-read volume. It also offers an entire chapter on acid rain and its effects...