Is this sweater warm enough for winter?

It is a lightweight thermal knit, so it works as a mid-layer under a coat or jacket. On its own it suits mild cool weather more than deep winter.

How does the sizing run?

The size chart lists chest, shoulder, sleeve and length figures that run smaller than typical US sizing, so check your measurements against the chart rather than your usual letter size.

What is the cable knit made of?

The listing does not name a fiber blend. It describes the fabric as elastic and easy to put on and take off, which points to a stretch knit rather than pure wool.

How should I wash it?

Cold water, no high-temperature ironing or bleaching, and hang or line dry. Wash it with like colors to keep the knit from fading.

Can I wear it for sports or active use?

The stretch knit is described as not hindering movement, but a cable turtleneck is better suited to daily wear, gatherings and photos than to workouts.