Shon Simon is an LA-based wholesale clothing manufacturer who makes masks for half the price that I've seen on Etsy. The price is even more astonishing given that the simple masks are made from modal—a soft, silky, semi-synthetic fabric made from wood pulp that I usually only see in high-end activewear. In addition to being light, it's also breathable and moisture-wicking.
The masks are washable, reusable, and two-layered, with stretchy ear loops. They also come in kid sizes and a variety of nude skin tones, and they are easy to buy in bulk.