Aqueous hair conditioner formula for heat-setting hair

There is provided an aqueous hair conditioner formulation for heat setting of hair, comprising: an aqueous carrier; and a modified carbohydrate polymer comprising a cellulose ether matrix material functionalized with (i) a trialkylammonium moiety of formula (I) wherein R1 is independently a C1-7 alkyl group and wherein the modified carbohydrate polymer has an ash and volatile corrected Kjeldahl nitrogen content TKN of from 0.75 to 2.5 wt%; and (ii) a hydrophobic substituent having 16 carbon atoms; wherein the modified carbohydrate polymer comprises from 0.005 to 1.5% by weight of the hydrophobic substituents based on the weight of the cellulose ether matrix material; wherein the hydrophobic substituents are randomly distributed across the backbone of the cellulose ether matrix material; wherein the cellulose ether matrix material has gt; a weight average molecular weight MW of 1,000,000 Daltons; and wherein the modified carbohydrate polymer has a weight lt based on the modified carbohydrate polymer; and 0.001