Inergize

Inergize is a San Diego cold plunge brand run by Inergize Health LLC, founded in 2022 by engineer Ciaran Flanagan after a crowdfunding launch.

It sells two cold plunges with its own Elite Chiller, which cools to 37 degrees F and heats to 104 degrees F: the Elite Tub, an inflatable drop-stitch tub that rolls into a backpack, and the Spire, an upright tub in red cedar over 316 stainless steel with a reclined seat. It also sells the chiller and the tubs on their own, with filters and care kits.

Inergize sells through its own US store, with free delivery to the lower 48 states and support from California.