Buy List with Steve Casimiro: Must-Haves for March

ALL-IN-ONE> Icebreaker’s 150-weight Velocity Zip has all the perks of wool—odor control, temperature regulation—plus one more: unparalleled comfort. The tissue-thin jersey is lighter than a T-shirt and as soft as cotton. Your go-to piece for swing-season hikes and rides ($85).

DATA BANK> With an oversize rectangular screen, the Timex Expedition WS4 gives the altimeter watch a much needed face-lift. Its ability to display multiple functions at once—altitude, temperature, weather forecast—lets you assess your environs without toggling through a million modes ($199).

HIGH ROLLER> Timbuk2 fans may be fawning over the brand’s first line of rolling luggage for its San Fran style, but we’re hung up on its clever design. The slim, 50.5-liter Checkpoint carry-on slides right into the overhead bin and sports extra-wide, wobble-proof wheels ($250).