Xenylon

Xenylon was an organic material created by processing a form of algae. Starfleet uniforms from the mid-2260s to the early 2270s were made of xenylon.

In 2269, Spock noted that while a shrunken Nurse Christine Chapel's uniform fit her perfectly, her titanium bracelet was too big for her. He then surmised (correctly) that spiroid epsilon waves only caused organic material to shrink, as the crewmembers and their xenylon uniforms had both shrunk at the same rate, while metal objects, such as Chapel's bracelet, remained their normal size. (TAS: "The Terratin Incident")

Starfleet uniform styles
By era:	2140s-Early 2160s • Mid 2160s • 2230s • Late 2230s-2250s • 2250s-Early 2270s • Mid 2270s • Late 2270s-2350s • 2350s-2370s • Late 2360s-Early 2370s • 2370s-Early 2380s • Early 2380s • Mid 2380s • Late 2390s • Early 2400s • 29th century • 32nd century • 33rd century
By type:	Casual duty attire • Alternate & parallel uniforms • Alternate reality uniforms • Fictional uniforms • Terran Empire uniforms
Related topics:	Assignment patch • MACO uniform and equipment • Starfleet decorations • Starfleet insignia • Starfleet ranks • Terran Empire ranks • Uniform