What are the differences between I-Tip, U-Tip, Flat-Tip Hair Extensions? And how to choose which one is suitable for you?
What is I-tip hair extensions?

I tip/stick hair is a type of human hair extension that is shaped like an "I" and is applied to the hair by the Micro-ring process, it is also called Cold Fusion hair extensions.
What is U-tip hair extensions?

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 extensions.
What is Flat-tip hair extensions?
And now the market appears a "new flat tip", which is the new hybrid of hair extensions that combines the benefits of both the I-Tip method (also known as micro-bead hair extensions) and the Tape-In method resulting in one innovative technique.
So what's better for you between I-tip and U-tip or flat tip hair extensions?
U-tip and the traditional Flat-tip hair extensions can only be applied using a heating tool to melt the keratin. And while these tools only use a fraction of the heat created by normal curling and flat irons (and they are only near the hair for a few seconds at a time), you may have fragile or damaged hair that you'd like to keep as far away from heat as possible.
Typical I-tip and new flat tip hair extensions are attached to your hair using a Micro-Ring process that involves pulling your hair through a small metal loop in the extension base. This loop is usually made of copper or aluminum, which is not recommended for women going through radiation or chemotherapy and can cut into your hair's cuticles, causing damage. Pulling curly or coarse hair through these rings can also lead to tangling, snarling, and extremely tough removal, so Micro Rings may not be the way to go for women with "springier" hair types.