You've seen PGA Pros wearing them, fishermen, runners, tennis players, anyone who wants maximum protection from the suns rays. The Sun Sleeves block up to 90% of UV rays...much better than any sunscreen lotion. They also absorb sweat which provides a cooling effect. Instead of being warmer when worn they actually make it feel cooler. Strange but true! We only carry one color, off-white as it goes with any outfit. The sizes relate to the thickness of your arm, not the length of the sleeve. The sleeves are long enough to cover your arm almost to your shoulder. Just roll them down if to long. Hand wash and let drip dry, they'll be like new.