At home as a top layer or worn as a mid-layer on especially crisp days, the vest may be the most versatile three-season layer for riding in variable conditions. For chilly descents and moody mornings, you’ll be glad to have the extra warmth of the high collar. Then when things heat up on the climbs, a two-way zipper allows for easy, one-handed venting adjustments. If the forecast is on the fringe, this minimal piece stows well in zipped pockets, so you can pedal with peace of mind.