Take your swim training to the next level with the Ultralight Snorkel Airflow Restrictor Set. The LRESCAP snorkel restrictor caps restrict airflow by 70% and 40% in order to effectively increase swimmers? lung capacities. The two-piece set comes in bright yellow and orange, so you can easily differentiate between the caps. Train hard, train smart with the Ultralight Snorkel Airflow Restrictor Set!