did he just put on an evening glove??

I watched my alternate mailman start to put my mail in the mailbox, stop himself, and start putting on what looked to be a glove.  At first I thought he was delivering biohazardous stuff (what did I order recently?), but those purple-blue nitrile gloves aren't that long.  It was blue and went way past his elbow.  Very long and elegant.

I watched him pulling it up for a good extended minute.  It seemed excessively tight and hard to maneuver.  I finally realized that it was some type of elbow compression sleeve.  Maybe to keep the sun off?  Maybe to prevent mailman's elbow? 

He finished with the cuff and eventually delivered my mail.  I'm way too nervous to see if it's a biohazard...