Designed to meet the demands of swift water rescue professionals, the NRS Universal Swim Fins also work well for river boarding and general river snorkeling. These rigid fins are symmetrical so they fit either foot. The wide heel strap is adjustable with a quick tug of the strap end, then you can unclip the strap and your adjustment stays put. The toe piece has a removable rigid insert that lets you select the stiffness you desire. The fins will fit over your river boots - just step in, click in the heel strap and you're ready to go!