That is an extra paid add-on! We sew in a tin tie — like the kind used to close your coffee bag — so you can conform the top of your mask to your nose. This can help with getting a good seal on your mask and relieve some of the nose-squishing.
The no-fog strip is a cotton flannel case for the nose wire that adds a bit of comfort, and also catches moisture from your breath to stop your glasses from fogging up.