Is this vest warm enough for winter?

It works as a mid-layer under a jacket in winter, not as outerwear on its own. The synthetic fill and sleeveless cut suit cool fall and spring days better than freezing temperatures.

No. It is a collared, sleeveless vest with a full front zip, so you would need a separate hat or hood in wet or windy weather.

Both the shell and the synthetic fill are recycled polyester, and the body uses baffle construction to keep the fill in place.

How should I size it?

It follows Adidas men's sizing and is meant to be worn over a shirt or hoodie. If you want a close fit, take your usual size; size up for bulky layers underneath.

No water-repellent or waterproof finish is stated. Treat it as a dry-weather layer and add a rain shell when it rains.

Can I wear it for golf or running?

The sleeveless cut suits golf and light activity in cool weather. For running, the synthetic fill can trap heat once you warm up, so it is better for warm-ups than hard efforts.