Eczema and Merino Wool: Decoding the Research

Anyone with sensitive skin is advised to wear cotton but dermatological research in the last decade or so has a better solution, especially useful in colder weather! Multiple clinical trials now show that merino wool is not only well‑tolerated by sensitive skin, but can actively improve eczema symptoms more than cotton can.

This article breaks down the science, the myths, and the clinical evidence so you can make confident, skin‑friendly fabric choices. 

Merino Wool is a Significantly Finer Fibre

Traditional wool has a reputation for being itchy but the culprit isn’t wool itself, it’s the fibre diameter.

• Coarse fibres (>30–32 μm) tend to stand stiffly away from the fabric surface, mechanically stimulating skin nerve endings and triggering itch
• Superfine merino wool (<18.5 μm) bends easily and does not activate itch receptors, making it soft, smooth and suitable even for sensitive skin.

This distinction is key, irritation is a mechanical response, not a wool‑specific one. Coarse synthetic fibres or other natural fibres can cause the same effect. The fibres must be fine to not irritate skin.

Merino Wool Is Not a Skin Allergen

A major 100‑year literature review by dermatologists and immunologists found no credible evidence that wool fibre itself causes allergic skin reactions. Instead, they found:

• Past “wool allergies” were usually reactions to processing chemicals, not the fibre
• Modern processing standards have dramatically reduced these residues
• International certification body Allergy Standards Limited (ASL) now recognises merino wool bedding as asthma & allergy friendly

Therefore, superfine merino is now considered low‑risk for allergy‑prone individuals.

Clinical Evidence: Merino Wool & Eczema (Atopic Dermatitis)

Atopic dermatitis, more commonly known as eczema, affects up to one third of infants and is strongly influenced by temperature, moisture, and skin‑barrier function. There has been a relatively small but very credible research cluster in Australia and the United States that have run multiple controlled clinical trials (which is rare in apparel) finding consistently that superfine merino wool decreases eczema severity. 

Core researchers in this niche:

• Dr Joseph Fowler Jr. (Dermatology Specialists Research, US)
  
• Dr John.C. Su (Monash University, Australia)
  
• Prof Adrian Lowe (Monash University, Australia)
• Queensland Institute of Dermatology Team
  

 Some of the Key Studies and their Findings:

1. Determining Effects of Superfine Sheep wool in INfantile Eczema (DESSINE) British Journal of Dermatology; J.C Su et. al. (2017)

A randomized crossover study of 39 infants and toddlers (4 weeks – 3 years old) with mild to moderate eczema found that wearing superfine merino wool for six weeks led to:

• Significant reductions in SCOring Atopic Dermatitis (SCORAD) eczema severity scores
• Improved quality‑of‑life scores (IDQOL)
• Reduced topical steroid use
• Merino wool was more effective than cotton or synthetic clothing

2. Adolescent & Adult Trial (Queensland Institute of Dermatology, Brisbane, 2017-2020)

Various studies took place with participants wearing superfine merino wool reporting:

• Less dryness, redness, and itch
• Reduced inflammation area
• Overall symptom improvement

3. University of Louisville Study (2019)

Children and adults wearing superfine merino wool clothing with eczema experienced:

• Improved Eczema Area and Severity Index (EASI) and SCORAD scores
• Better quality of life
• No adverse skin reactions

4. Ongoing Large‑Scale DESSINE2 Trial (see 1.)

A 150‑participant international study is further evaluating wool vs. cotton in moderate–severe childhood eczema.

The part you can't miss is that across all trials, superfine merino wool consistently outperformed cotton for eczema management.

Why Merino Wool Helps Sensitive Skin

1. Superior Moisture Management

Merino wool can absorb up to 30% of its weight in moisture vapour while still feeling dry - far more than cotton or synthetics. Cotton is actually hydrophilic, meaning it is exceptionally good at absorbing and retaining water (as it needed to as a plant). Merino wools superior moisture management helps:

• Reduce dampness against the skin
• Minimise sweat‑related irritation
• Support a healthier skin barrier

All of these things reduce the severity of skin conditions, including eczema.

2. Natural Thermoregulation

Bodies quietly work really hard to maintain a healthy body temperature - even more so for babies still developing thermoregulation. Merino wool fibres create a stable microclimate by buffering temperature and humidity fluctuations, both major eczema triggers.

Don't underestimate this unique superpower of merino wool when trying to manage skin conditions.

3. Breathability & Reduced Overheating

Overheating is a common eczema trigger, particularly in babies who are still developing thermoregulation and naturally run a little hotter for a few different reasons. Merino’s breathability helps maintain a comfortable, regulated environment next to the skin reducing skin irritation.

4. Softness & Low Friction

Superfine merino wool reduces mechanical irritation thanks to its flexible, ultra‑fine fibres.

Conclusion

Superfine merino wool (which is almost all merino wool) isn’t just soft and comfortable, it’s clinically proven to be:

• Non‑allergenic
• Well‑tolerated by sensitive skin
• Beneficial for eczema symptoms
• Superior to cotton in moisture and temperature regulation

When you choose garments made from <18.5 μm superfine merino (nearly all merino wool), you're choosing a fabric that supports comfort, skin health, and overall wellbeing, especially for babies and children with delicate or eczema‑prone skin.

Learning more: Woolmark operates as an independent, non-profit authority that sets global standards for wool quality. They have up-to-date information and easy-to-follow resources, as do the academic institutions listed above. I use their videos and resources and recommend you do so the same to find out more.