This all-weather Rite in the Rain Trekker "space pen"writes on wet paper and upside down in temperatures from -30F to 250F. Flat Black Metal barrel has a comfort grip. You probably won't lose this pen since the Trekker's cap has a convenient ring to attach to a lanyard.  The Trekker pen works as well underwater and above.  It is a favorite of geologists, oceanographers, environmentalists, wildlife officials and sports officials.