Next, I started flipping through the cards. These pocket-size cards are printed on durable, tear-proof, weather-proof plastic, which is a solid upgrade from the paper cards that many of us have seen before. They're loaded with detailed info on shelter building, signaling for help, trap and snare construction, fire building tips, land navigation skills, and many field-learned survival tips. It's clear that the author did his homework, and has the field experience to back it up. I think we've all come across "arm chair" survival experts, who simply rewrite ideas that others have put forth. These cards hold the knowledge of someone who has been there and done it for themselves.