Is this shirt good for hot weather running?

Yes. It is Smartwool's lightest short-sleeve knit, rated for warm conditions around 10–20°C and above, and it wicks and breathes well. It suits sweaty efforts better than heavier merino tees.

Does merino really resist odor?

Merino wool naturally slows odor buildup, and owners report wearing it several times between washes. It still needs airing and regular washing, but less often than polyester.

How does the fit run?

It has an athletic cut that sits close to the body. If you are between sizes or prefer room, size up; the shoulders and chest are the tightest areas.

Can I wear it with a backpack?

Yes. The offset shoulder and side seams are placed to avoid pressure points under straps, which is why hikers favor it.

How should I wash it?

Machine wash cool on a gentle cycle and line dry. Skip fabric softener and dryer heat, which shrink and wear merino blends.

How does it compare with a polyester running tee?

It breathes and controls odor better and feels softer, but it is thinner and less abrasion-resistant than polyester. Choose it for comfort and freshness, not rugged durability.