ISO Maintamer Straightening System is a 2-step straightening system that achieves unsurpassed smoothness, manageability, and shine, leaving hair in excellent condition. ISO Maintamer Straightner is ideal for smoothing coarse hair, taming unruly curls and waves, un-perming ends and controlling frizzy hair. Discover the ISO Maintamer Straightening System. 2 steps away from beautiful, healthy, straight hair. Use Maintamer as a straightener or as a Re- texturizer. Ideal for smoothing coarse hair, taming unruly curls and waves, unperming ends and controlling frizzy hair.