The Finis Snorkel Cardio Cap is placed on the end of your Finis Swimmers snorkel. This device Increases the ability of the muscles to work better when oxygen levels are low (Hypoxic Training).
The cap replicates a higher altitude training environment in your own pool.
Note: This is for the Swimmers Snorkel only
Remember to add your postage option (once per order) see https://www.wellnessliving.com/rs/catalog-view.html?id_sale=4&k_id=1605894&k_option=5906325