Trick Hat: Owning different helmets for different sports takes up a lot of closet space -- and most styles offer little fashion traction. Enter the multisport helmets from Bern Unlimited, which look cool and with exchangeable linings can take you from spring's first cycle trip all the way through ski season. $60 to $120 at Ski Market, 860 Commonwealth Avenue, Boston, 617-7731-6100, skimarket.com