The power of the ampersand

gistfile1.scss

.product {
  
  h1 {
    color: #c00;
  }

  .image {
    float: left;
  }

  .small & {
    .image {
      float: none;
    }
  }

}

// makes
.product h1 {
  color: #c00;
}

.product .image {
  float: left;
}

.small .product .image {
  float: none;
}