Slick

Slick: Slick armor seems coated at all times with a slightly greasy oil. It provides a +5 competence bonus on its wearer’s Escape Artist checks. (The armor’s armor check penalty still applies normally.)
Faint conjuration; CL 4th; Craft Magic Arms and Armor, grease; Price +3,750 gp.

Slick, Improved: As slick, except it grants a +10 competence bonus on Escape Artist checks.
Moderate conjuration; CL 10th; Craft Magic Arms and Armor, grease; Price +15,000 gp.

Slick, Greater: As slick, except it grants a +15 competence bonus on Escape Artist checks.
Moderate conjuration; CL 15th; Craft Magic Arms and Armor, grease; Price +33,750 gp.