So many puns, so little time… the 686 NASA Men's Knit Beanie, knit from hypoallergenic no-itch acrylic yarn with reflective yarns to make you more visible when you’re humping through the parking lot at dusk. A ribbed cuff beanie you can adjust to fit your head, NASA patch.. the winter hat for those who like to launch themselves, defy gravity, and understand the science of snow. Geek on, people, geek on.