From D&D Wiki
|This material is published under the OGL 1.0a.
Fire Resistance: A suit of armor with this ability normally has a reddish hue and often is decorated with a draconic motif. The armor absorbs the first 10 points of fire damage per attack that the wearer would normally take (similar to the resist energy spell).
Fire Resistance, Improved: As fire resistance, except it absorbs the first 20 points of fire damage per attack.
Fire Resistance, Greater: As fire resistance, except it absorbs the first 30 points of fire damage per attack.