Feather flags can be printed on both sides, but not all feather flags are double-sided. Single-sided feather flags have the design printed on one side of the flag, with the design visible from one direction. Double-sided feather flags have the design printed on both sides of the flag, with the design visible from both directions.
Double-sided feather flags are a good option if you want your message to be visible from both sides, especially if your feather flag is going to be placed in a location where it can be seen from different angles. However, they are typically cost more than single-sided flags, so you'll need to decide if the extra cost is worth it for your specific marketing needs.