Ear savers help alleviate mask discomfort by taking the straps off of your ears.
Regular length should work for most people/masks. For those with larger heads or shorter mask straps, the extra long version is recommended.
There are two styles available: Open back and solid back with holes to loop the mask strap through (keeps the ear saver attached to the mask).
Regular: 12.5 cm
Extra Long: 16.5 cm