U tip/nail tip is a type of human hair extension that is shaped like a U and is applied to the hair by heating up, it is also called Hot Fusion hair extension. U tip hair extensions are hair extensions that are pre-tipped with keratin and are applied to the client by use of a hot hair extension iron.Remy human hair Nail Fusion pre bonded hair extensions.U Tip hair extensions can be styled as normal and it will lie perfectly straight and will blend with your own hair to create a glamorous look you've alway dreamed of.Great deals on nail tip human hair extension at Silanda Hair. Many U tip hair extensions for you to choose. Made with high quality Italian Keratin.