English descriptions of commonly used hair extension terms

U

U-Part Applications

This is a type of application used by stylists when applying hair extensions to the customer’s hair. The U-shape is designed to follow the natural contour of a customer’s hairline so that the hair extension is is comfortable after installation.

Ultrasonic Iron

This is a type of iron that is used as part of connecting hair extensions as part of the cold fusion technique. This technique does not use heat, but rather electromagnetic energy to melt the keratin. These irons are becoming more and more popular as they do not require time to heat up, are effective in melting the keratin, and for many stylists and customers, they feel more comfortable when there is no heat.