Stefanie

For sale: Castelli aero nano shoe covers in black size small. $20. Only used a few times so they are in perfect condition. I'm located in White Salmon, but am often in both Portland and Vancouver.

Here is how Castelli describes them:
AERO NANO SHOECOVER
PERFECT FOR MOST BOOTIE RIDES
Many of your rides with booties are in cool but not brutally cold conditions, maybe with wet roads or some rain, and of course you always want to be aero and fast. That's the thinking behind this bootie: aerodynamic for use in WorldTour TTs and water- and windproof fabric with sealed seams to keep the water out. It doesn't have any insulation so it won't cover your really cold-weather rides, but it's spot on for everything else. The upper portion is very stretchy, a silicone bead at the top helps prevent water coming in, and it has taped seams and a water-resistant zip, so this shoe cover is ideal for all but truly cold-weather conditions.

https://portland.craigslist.org/grg/bop/6037232062.html