A crosslinked polysiloxane comprises polysiloxane chains substituted by an ester-containing organic moiety joined by crosslinks derived from the reaction of an alpha, omega-diunsaturated hydrocarbon or fluorohydrocarbon with Si—H groups on the polysiloxane chains. The ester-containing organic moiety has the formula -A-COOR where A is an alkylene linkage having 1-18 carbon atoms which is optionally fluoro-substituted and R is an alkyl or fluoroalkyl group. The crosslinked polysiloxane can form an elastomeric gel in a liquid organic or silicone material, which is useful in preparing cosmetics.