Disclosed herein is a hair treatment application system (10) and methods to use the same. The hair treatment application system (10) comprises the combination of at least one absorbent substrate (30) having specific median pore radius of from about 300 microns to about 3,000 microns and of one or more hair treatment composition (15), each having a viscosity of from about 3,00 cPs to about 150,000 cPs. The hair treatment application system (10) according to the invention allows for easy, non-messy and precise application of hair treatment compositions (15) in particular of highlighting compositions.
