Wella EIMI Boost Bounce The Boost Bounce is a mousse for curly and wavy hair. It gives new bounce with powerful definition. The hair gets a brilliant shine, are protected against frizz and during blow-drying from drying out. Successor to the Wella Wet Boost Bound. Hold factor 2 of 4 Application: Work evenly into towel-dried hair. Then dry the hair as usual.