Women's Ultralight Merino Wool T-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.
What if it gets a hole?
It's covered. 100% merino at 140 GSM is lighter and more delicate than a synthetic blend, so every Wülf Wool shirt comes with a 1-year hole guarantee: if it develops a hole from normal wear within a year of purchase, email a photo and your order number to Support@wulfwool.com and we'll send you a free replacement. Full details at wulfwool.com/pages/guarantee.
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.