Does this hat block UV rays?

No UPF rating is stated. The fabric is a cotton-polyester blend, which shades the face but is not certified sun protection. For long exposure, choose a hat with a labeled UPF rating.

Will it stay on in wind?

There is no chin strap or drawcord, and the fabric is light. It is listed as windproof, but on a breezy beach or boat it can lift off. A hat clip or a snugger fit helps.

Yes, it comes as a single hat with no size options listed. The soft dome crown and fabric give some stretch, but there is no adjustable band.

Can I pack it in a suitcase?

Yes. The soft cotton-polyester brim folds and packs flat. Expect to reshape the brim by hand after unpacking, since it has no wire or stiffener.

What colors are available?

Red, yellow, orange, white, black, sky blue, dark blue and green, all in the same polyester-cotton fabric.

Is it good for hiking or sports?

It is better for casual wear. There is no sweatband, venting or secure strap, so for hiking or running a technical sun hat with a chin cord and UPF rating is the better pick.