Women's Ultralight Merino Wool Long Sleeve Shirt
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Frequently asked questions
Does merino wool smell after sweating?
No — merino wool naturally resists odor. The fiber binds odor-causing bacteria and releases them in the wash, so you can wear a Wülf Wool shirt for multiple days of activity between washes. Many merino wearers go 3–5 wears before washing, even after sweating.
Is 140 GSM merino too hot for summer?
No — 140 GSM is an ultralight fabric weight, at the lightest end of merino jerseys (most merino shirts run 150–200 GSM). The 17.5-micron superfine fibers wick moisture and regulate temperature, so it wears cooler than cotton in the heat. It's built specifically for warm-weather hiking, trail running, and mountain biking.
How often do I need to wash it?
Far less than a synthetic or cotton shirt. Because merino resists odor and wicks moisture, airing the shirt out overnight is usually enough between wears. Wash it when it's visibly dirty — typically every 3–5 wears rather than after every use.
How do I wash merino wool?
Machine wash cold on gentle with mild detergent, then lay flat to dry. Avoid fabric softener, bleach, and high-heat drying, which damage the fiber. Drying on low heat or until damp works when necessary, but isn't recommended regularly.
Is this 100% merino wool or a blend?
100% superfine merino wool — 17.5-micron fiber, no synthetic core or polyester blend. The natural 4-way stretch comes from the knit, not elastane.
How does it fit?
Athletic fit with fitted sleeves and a lengthened torso with a drop hem, cut to stay put during movement. It fits true to size. If you're between sizes, size up.
Is a long sleeve too warm for summer?
At 140 GSM, the long sleeve is light enough for sun protection without overheating. The extra coverage is for UV and brush, not warmth. It regulates temperature the same way the tee does.
Why merino
Merino, polyester, cotton
How the three fibers compare against your skin.
| Merino wool | Polyester | Cotton | |
|---|---|---|---|
| Fiber | Natural, renewable, biodegradable | Petroleum-based; not biodegradable | Natural plant fiber; biodegradable |
| Temperature | Breathes; helps regulate body temperature | Breathability depends on the knit | Breathable while dry |
| Sweat | Absorbs moisture vapor; feels less clammy | Absorbs little; wicks along the surface | Soaks it up and stays wet |
| When damp | Still feels warm | Feels clammy | Feels cold and heavy |
| Drying | Slower than polyester | Fastest | Slow |
| Odor | Resists odor; wear it more than once | Tends to hold odor | Holds less than polyester |
| In the wash | No microplastics | Sheds microplastics | No microplastics |
General fiber properties; individual fabrics vary.
Why ours
Not all merino is equal
What goes into our jersey, next to a typical merino tee.
| Wülf Wool | Typical merino tee | |
|---|---|---|
| Fiber | 100% merino wool | Often blended with nylon, polyester or other fibers |
| Fineness | 17.5 micron superfine | Varies by brand; often not listed |
| Yarn & knit | Double-spun jersey | Often reinforced with nylon for strength |
| Weight | 140 GSM ultralight jersey | Commonly 150–200 GSM |
| Certified | Woolmark, RWS and OEKO-TEX® Standard 100 | Varies by brand |
| In the wash | No microplastics | Synthetic content can shed microplastics |
Based on the published specs of popular merino tees; individual products vary.