Icebreaker 150 MerinoFine Ace Longsleeve <tc>Women</tc>

This hoodie feels light, soft, and supple. The raglan sleeves give you plenty of freedom of movement, and the seams are positioned so that nothing chafes under a cardigan or backpack. The thumb loops keep the sleeves in place, and the hood fits comfortably without feeling too bulky.

It performs best in cool weather and during high-intensity exertion. Think of a vigorous trail run in the Veluwe, a mountain trek in the Alps on a crisp morning, or a long endurance run where the pace varies. On a long climb, when you start to sweat, you notice the difference: the wool regulates your temperature, so you don't get too hot and don't cool down quickly if your pace drops. After a day in the mountains, it barely smells, and the UPF protection helps against the sun in exposed areas.

If in doubt, look at the weather and how hard you sweat. The fabric does not block wind or rain, so you will need a jacket on a windy ridge. Merino dries slower than a synthetic shirt, so during heavy sweating sessions in the heat, a thin synthetic shirt will feel drier. If you are looking for a light layer for cool, intense runs, this is a good choice.

In short: a lightweight merino hoodie for cool runs where you work hard.