2(X)ist pop-up

1411 Broadway at 40th St. Subway: N, Q, R, 42nd St S, 1, 2, 3, 7 to 42nd St–Times Sq. Not only will guys score 25 percent off signature briefs, trunks and long underwear at this temporary shop, but 100 percent of the proceeds will benefit the American Red Cross in Greater New York (nyredcross.org) and its Hurricane Sandy relief efforts. Grab basics—including cotton briefs for $11 (usually $14) and long-sleeved henleys, cut from $28 to $21—and preview the brand’s debut watch collection ($200–$400), available for purchase in early February.