Surround Ultra with ProFresh is the first encap to actually incorporate encapsulating odor counteractants. ProFresh is a true odor absorber not just a mask. ProFresh chemically alters volatile odors rendering them undetectable (i.e. non-volatile) so they do not reach the olfactory nerve and therefore cannot be smelled. Now, for the first time, your encap product won't smell like a typical cleaning product, but will retain excellent cleaning power, encapsulation properties, acid dye resistors and all of the features you expect in a double strength Ultra premium encapsulant. Surround Ultra has truly set a new standard in encapsulation features and performance. ProFresh is Surround Ultra's signature fragrance. With a crisp scent of effervescent ozone and white florals that combine naturally bright accents of eucalyptus, spearmint, and lime to provide a sense of outdoor freshness that has never before been achieved in an encapsulant detergent. The days of smelling harsh glue-like chemicals and coughing are finally gone!