Good evening. I'm looking for good ways to make wrist and ankle restraints.

We do not use restraining play very often (and have a tight budget), so I'm going the homemade route. In the past we've tried soft nylon rope, but while I'm comfortable tying it (being an eagle scout good for sex, who would have thought), my wife is not. I'd like something easier to secure in the heat of the moment.

What have you built, or seen work well?