This is the formula the Apres family was built on. 

The Apres signature Extend Gel is the foundation to everything related to the Gel-X™ system. This revolutionary soft gel formula is used to help adhere the Gel-X™ extensions onto the natural nail. When applied correctly, our Extend Gel imparts both strength and flexibility while making it easy to create beautiful, long lasting nails that are also easy to soak off and remove. If you want to know what Apres is all about, try a bottle of Extend Gel and see what they've built their entire collection around.