Is the Alo Glacier Puffer warm enough for winter?

It is a puffer, so it traps warmth for mild cold and layering. Alo does not publish a fill power or temperature rating, so treat it as a lifestyle jacket, not a deep-winter or wet-weather shell.

What is the two-way zipper for?

A two-way zip opens from the bottom as well as the top. That lets you unzip the hem for sitting or walking and vent heat without taking the jacket off.

Does it run true to size?

Alo lists it in standard adult sizes. Puffers are usually cut to layer over a sweater, so if you want a close fit, consider your usual size; if you plan to layer heavily, size up.

How does it compare with outdoor-brand puffers?

Outdoor brands publish fill, shell fabric and waterproof ratings. The Glacier Puffer focuses on Alo's styling and a two-way zip, so pick it for looks and everyday warmth rather than technical performance.