Conjuration (Creation) [Force]
Level: Sorcerer/wizard 3
Components: V, S
An invisible sheen of armor-shaped force surrounds you.
This spell functions like mage armor (PH 249), except that it requires no material component and its tangible field of force provides a +6 armor bonus to Armor Class.
Source: Spell Compendium
Mage Armor
Conjuration (Creation) [Force]
Level: Sor/Wiz 1
Components: V, S, F
Casting Time: 1 standard action
Range: Touch
Target: Creature touched
Duration: 1 hour/level (D)
Saving Throw: Will negates (harmless)
Spell Resistance: No
An invisible but tangible field of force surrounds the subject of a mage armor spell, providing a +4 armor bonus to AC. Unlike mundane armor, mage armor entails no armor check penalty, arcane spell failure chance, or speed reduction. Since mage armor is made of force, incorporeal creatures can’t bypass it the way they do normal armor.
Focus: A piece of cured leather.
Source: Player's Handbook