SWTHZ Sugar House

SWTHZ Sugar House is a contrast-therapy studio on Wilmington Avenue where each guest takes a private 60-minute suite holding an infrared sauna, a cold plunge and a vitamin-C shower. A first visit costs $35 and a single drop-in $60, with monthly plans from $79, and an EGO beauty bar with Dyson tools is set aside for getting ready before heading back out.