Fits on top of any FINIS snorkel (except the Learn-to-Swim Snorkel) to restrict air flow for increased cardiovascular conditioning.

Mike Bottom - Head Coach, University of Michigan Men's Swimming

Regular use of the snorkel during training also increases CO2 tolerance and VO2 max. When used with the FINIS CARDIO CAP accessory, the snorkel increases the conditioning and workload to the lungs by an additional 40%, providing benefits equivalent to those associated with altitude training.