Joico K-Pak Liquid Reconstructor Leave-in Treatment took everything great about their award-winning Reconstructor and turned it into a liquid formula that's ideal for those with fine, fragile hair. Despite the lightweight formula, this powerful combination of amino acids and Keratin rebuilds and re-fortifies stressed strands, returning hair to its former glory in a single-use application! (Joico K-Pak Liquid Reconstructor Leave-In Treatment - 10.1oz.)