.woocommerce-Tabs-panel--product_shapes_sizes {
    
}

.woocommerce-Tabs-panel--product_shapes_sizes .row .col-xs-12:nth-child(1) table th::before {
  content: '[r] ';
}

.woocommerce-Tabs-panel--product_shapes_sizes .row .col-xs-12:nth-child(2) table th::before {
  content: '[h]';
}

.woocommerce-Tabs-panel--product_shapes_sizes .row .col-xs-12:nth-child(3) table th::before {
  content: '[s] ';
}

.woocommerce-Tabs-panel--product_shapes_sizes .row .col-xs-12:nth-child(4) table th::before {
  content: '[f] ';
}