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Uslysses's Mask is a piece of headwear in the Fallout: New Vegas add-on Lonesome Road. Ulysses is seen wearing it, but it is not explained why, as the courier can inhabit the same area with no defects.
Uslysses's Mask is identical to the Breathing Mask in appearance. It gives the player no practical use other than appearance, but unlike the Breathing Mask however, it gives an astounding 50+ Radiation Resistance opposed to the Breathing Mask's mediocre +5.