It sticks very quickly and withstands washing. It doesn't look like a patch has been applied. If placed correctly, it looks like it's part of the pants design.

Good for its price, it slightly peels on some synthetic fabrics, and it needs to be ironed again

Very easy to apply. They stick well and don't come off with washing. The material is a bit hard and doesn't wear easily. Maybe a second ironing may be needed after the first wash.