TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The cationic surfactant comprises a dioxolane group of formula (A), or formulae (1-5). It also comprises 1-O-alkyglycerol group of formula (B) or formula (6). It also comprises a siloxane group of formula CH3-(CH3)C(CH3)-(R4)Si(R5)-O- (C) or formula CH3-(CH3)C(CH3)-(R4)Si(R5)-O-X-(R')N+(R''')(R'') (7). It also comprises beta-aryloxy sulfone group of formula (D) or formula (8). The cosmetic agent(s) is a reducing agent, oxidizing agent, moisturizer, emollient, sunscreen, direct dyes, oxidation dye precursors, pigments, mineral fillers, clays, hydroxy acids, colloidal minerals, fragrances, fixing or non-fixing polymers, vitamins or provitamins, thickeners, antidandruff agents, sequestering agents, mineral or organic acids and bases, peptizers, preserving agents, conditioning agents or additional surfactants.In formulae (1-5),R1-R3=H, OH, optionally substituted from amino group, HC-based chain containing 1-100C, optionally interrupted with hetero atom(s) or carbonyl groups and optionally substituted with group(s) from OH, halo or amido groups;R', R'', R''', R'2, R''2, R'''2=1-6C, preferably 1-4C alkyl or hydroxyalkyl group;X, X'=divalent group, preferably 1-30C alkylene group.At least one of R1, R2, or R3 is a hydrocarbon-based chain containing greater than or equal to8C.In formula (6),R1=H, OH, optionally substituted amino group, HC-based chain containing 1-100C, optionally interrupted with hetero atom(s) or carbonyl groups and optionally substituted with group(s) from OH, halo, or amido groups;R', R'', R''', R'2, R''2, R'''2=R' in formulae (1-5);X, X'=X in formulae (1-5).At least one of R1, R2, or R3 is a hydrocarbon-based chain containing greater than or equal to8C. In formula (7),R4, R5=H or 1-30C alkyl;X=X in formulae (1-5);R', R'', R'''= R' in formulae (1-5).In formula (8),X=X in formulae (1-5);R', R'', R'''= R' in formulae (1-5);R6=(un)saturated HC-based chain containing 8-100, preferably 8-50C, optionally interrupted with hetero atom(s) or carbonyl groups and optionally substituted with group(s) from OH, halo, or amido groups.Preferred Composition: The cationic surfactant is 0.01-40, preferably 0.1-25 wt.%. The cosmetic agent is 0.001-20, preferably 0.01-10 wt.%.    TECHNOLOGY FOCUS - POLYMERS - Preferred Component: The cosmetic agent(s) is fixing or non-fixing polymers, antifoams, or plasticizers. EXAMPLE - A cosmetic composition was prepared from cetearyl alcohol (2.5), cetyl esters (0.5), dioxolane 1 (1.5), and water (Qs 100%). It was applied to a lock of sensitized hair and was then rinsed off with water. It conferred good cosmetic properties to the hair.