These all-weather sets of cards give you references, templates, and notes in a pocket-sized package. The infinite rewrite capability and textured surface ensures your notes with markers, pens, and pencils remain until you are ready to erase them.

THULS began in the 2000's when a Marine Corps Scout Swimmer decided paper didn't work underwater. After printing on plastic he decided to tackle "cold fusion". We're still waiting on that, but in the meantime, we at least have waterproof manuals and references.