SASS + BEM with CamelCase-syntax

.FeaturedProduct { // Block: .FeaturedProduct

  &--onSale { // Modifier: .FeaturedProduct--onSale
    ...
  }

  &-header {
  // Element: .FeaturedProduct-header
    ...
  }

  &-img {
  // Element: .FeaturedProduct-img
    ...
  }

  &Wrapper {
  // Block: .FeaturedProductWrapper.  This is a block (usually without any elements belonging to it) that wraps the .FeaturedProductBlock. It's just a wrapper, for when you need it.
    ...
  }
}