Sun Hoodie

A layer worn to stay covered, not to stay warm

A sun hoodie is a thin, long-sleeved hooded top made from light synthetic fabric, worn in hot weather rather than cold. It exists because shade is easier to carry than to find: anglers on open water, walkers on exposed ridges and runners in midsummer all end up covered rather than bare. The range takes in quick-dry knits, zipped and pullover cuts, and versions with a built-in neck gaiter.

How can wearing more make you cooler?

Direct sun on skin adds heat the body then has to shed. A light, loose knit blocks a good share of that while still letting air move across the skin, and the fabric wicks sweat outwards so it evaporates from the surface of the cloth rather than pooling. That is the whole trick, and it only works while the fabric stays thin and the fit stays loose. A heavy top does the opposite, which is why a sun hoodie sits at the other end of the wardrobe from a fleece jumper.

What are the hood and thumb loops for?

The hood covers the back of the neck and the ears, which are the two places a cap misses and the two places that burn on a long day facing forwards. Worn under a cap the peak still shades the face while the hood handles everything behind it. Thumb loops hold the cuff over the back of the hand and stop the sleeve riding up when arms are moving constantly. A gaiter collar pulls up over the nose when the light comes off water or snow.

What should be looked at before choosing?

• Fabric weight: light knits breathe and dry fast, denser weaves block more sun and take longer to dry after a soaking.
• Hood cut: a scuba-style hood stays up on its own, a drawcord hood needs pulling in but packs flatter.
• Closure: a quarter or full zip vents at the chest, a pullover has less to fail and sits lighter.
• Seams: flat seams matter under a rucksack strap or a fishing harness, where a raised seam rubs within an hour.
• Colour: pale shades reflect more heat, darker shades hide dirt and generally block more light through the cloth.

How close should the fit be?

Close enough that it does not flap, loose enough that air moves between the fabric and the skin. A top stretched tight against the shoulders lets more light through where the yarns pull apart, and it stops the wicking working properly. Sleeves want to reach the base of the thumb, and the body wants to be long enough to stay tucked when you reach up. If a snug technical fit is what you are after, the cuts in tactical hoodie sit closer to the body.

Does it replace a jacket?

No. This layer stops sun and moves sweat; it does not stop wind or rain, and once it is soaked it cools you quickly. On a changeable day it works as the layer next to the skin with something from windbreaker in the pack for when the temperature drops. Wash it cool, skip fabric softener, since the coating that softener leaves behind is what kills the wicking.