You can also wrap your forearm with a dark colored shoestring or piece of twine. I have a coat that I used to wrap - similar scenario. Electric tape works too - easy on, easy off.

Somewhere, a representative from Under Armour is reading this thread and designing a camo UA compressionwear forearm sleeve with a thumbhole on the end as we speak. He is clicking wildly and overdosing onstale Starbucksas he waits impatiently for the director of outdoors marketing to get into the office. This could be his big idea that vaults him to the next level of the corporate hierarchy.