(Photo: Bobby Doherty/New York Magazine)

Very Cold
Unless Spa Castle’s Premier 57 reopens, the only ice sauna in the city is at a traditional Russian banya in Brooklyn; post–sweat sessions, regulars sit for as long as they can take it in a small refrigerated hut. $40 at Mermaid Spa, 3703 Mermaid Ave., nr. W. 37th St., Brighton Beach; 347-462-2166.

Kind of Cold
The Cryo 3R facial actually takes place on heated treatment beds at the Peninsula Spa. An icy mix of serums is massaged onto the face, leaving mugs less puffy and more flushed, aprés-ski-like. $350 for 90 minutes at 700 Fifth Ave., nr. 55th St.; 212-903-3910.

Not That Cold
If testimonials are to be believed, CoolSculpting—a newish nonsurgical alternative to lipo, wherein an applicator freezes and then breaks down fat cells—is an hourlong way to reduce thigh jiggles. $850 with Dr. Amy Wechsler, 3 E. 69th St., nr. Fifth Ave.; 212-396-2500.