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Flip-flops are fine in summer—but in cold weather, switch to The North Face Nuptse Bootie III. These high-cut, 700-fill down toasters are much more than tent slippers. A lugged rubber sole provides traction on snow and wet rocks, and an elastic cord cinches the top to seal out icy drafts.
“Ultralighters may find them a bit bulky and heavy,” said one tester. “But when I have to posthole to go pee at midnight, I don’t care.” $85; 1 lb. 4 oz.; thenorthface.com