These periods are indicative only, and whilst we will make every effort to ensure that you receive your delivery in good time, we do not guarantee delivery before the end of the specified period. All of Stranded’s synthetic extensions can be heated up to 180 °C but I’ve found that the hair keeps its style really well and haven’t actually used any heat on them so far. It’s recommended that you only use heat to adjust the hair rather than completely restyling it. This table indicates the typical delivery periods for the different delivery methods. Delivery Method Unfortunately due to strict Royal Mail regulations regarding sending certain items, not all items are available for delivery to all destinations. We cannot currently ship the following items outside the UK: Aerosols, Flammable liquids, Nail Polish, Perfume or Aftershave. The one-piece extensions have five silicone coated clips which helps to give them extra grip so that they stay perfectly in place and don’t slide. There’s also plenty of hair on the one-piece clip in, with 160g of hair, on the 20-inch set, which I find blends easily with my own hair. The hair on the extensions also looks really natural, and not overly shiny like some synthetic hair can.