Indulgence is about the good things in life.
In an indulgent culture it is good to be free. Doing what your impulses want you to do, is good. Friends are important and life makes sense. In a restrained culture, the feeling is that life is hard, and duty, not freedom, is the normal state of being.
The tendency to allow relatively free gratification of basic human drives related to enjoying life and having fun, or the conviction that such gratification needs to be curbed and regulated by strict social norms.
With Indulgence orientation, there is a perception that one can act as one pleases, spend, or indulge in leisure and fun-related activities with friends or alone. All this leads to a relatively high level of happiness.
With Restraint orientation, one's own actions are restrained by various social norms and prohibitions, and there is a feeling that enjoyment of leisurely activities, spending, and other similar types of indulgence are somewhat wrong.