Is it really machine washable?

Yes. The merino yarn is treated to survive machine washing. Use a wool or delicate cycle with cold water and lay it flat to dry to protect the shape.

How does it compare with a cotton polo?

It is warmer, lighter and resists odor better than cotton. It also looks dressier, so it works under a blazer as well as on its own.

Merino is much finer than standard wool, so most people wear it directly against skin without irritation. Those very sensitive to wool may still notice it.

How should I size it?

It is cut as a trim sweater polo. If you plan to layer it over a shirt, consider going up a size; worn alone, take your usual size.

Some pilling is normal for fine merino at friction points like underarms and cuffs. A fabric comb removes it, and pilling usually lessens after the first few washes.