Following its release in March of the world’s first commercially available product made from manmade spider silk—a a line of snazzy neckties—California’s Bolt Threads is ready for its encore. Developed with Best Made Co., an outdoor-lifestyle brand that the technology firm unexpectedly acquired in August, the limited-edition Microsilk Cap of Courage marries Wyoming-milled Rambouillet wool with Bolt Threads’ signature yeast-derived bioengineered silk. Despite the eye-watering price of $198, a limited-edition run of 100 hats sold out in a matter of hours on Thursday. Spider silk is one of Earth’s most valued textiles: It’s five times stronger than steel and thrice as tough as nylon or Kevlar, yet only a fraction of the width of human hair.