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 Chafe free
//  Seamless
//  Moisture wicking

Merino Women's Runderwear™ Briefs

31 reviews


31 reviews
Size Guide?

Free Worldwide Delivery on Orders Over £30

The Runderwear™ Women’s Merino Briefs are designed to deliver the ultimate, comfortable running experience. The unique combination of the ultimate moisture-wicking and temperature-control properties of Merino, breathable mesh panels and seamless and ergonomic design, ensure that the Runderwear™ Merino Briefs are the most premium, performance underwear available. Features include:

Ultimate Comfort – super-soft, high-grade merino wool and an ergonomic design combine to create briefs that move with your body for ultimate comfort. Runderwear™’s Merino Briefs are label-free and the super-soft material prevents irritation, rubbing and chafing, no matter how far you push the limits.

Natural Anti-Bacterial Properties - Merino wool naturally absorbs moisture and can absorb up to 3 times its own weight, resulting in less sweat on your body. Merino even absorbs the odours from sweat meaning that you can wear merino wool for several days without the need for washing – perfect for those competing in ultra-distance racing.

Natural Temperature Control – Merino wool ensures you stay at the optimal temperature – warm in cold, harsh environments and cooler when the temperature rises.

Seamless Design - 360 degree seamless design resulting in no side seams for ultimate comfort and chafe-free running. Flatlock fine-stitching means that edges are flat, eliminating irritation and rubbing and minimising VPL.

Breathable, Dry and Chafe-Free - uses mesh panels containing micro perforations to increase breathability and sweat removal from your skin, reducing friction keeping you dry and chafe-free. The Merino range comes with a chafe-free guarantee, no matter how many miles you run.

Lightweight Durability – lightweight technical fabric which is highly-durable, washes-well and dries quickly.

Size Guide
UK 8-10 10-12 12-14 16-18
USA 4-6 6-8 8-10 12-14
FRANCE 36-38 38-40 40-42 44-46
ITALY 40-42 42-44 44-46 48-50
GERMANY 34-36 36-38 38-40 42-44
JAPAN 9-11 11-13 13-15 17-19
To Fit s m l xl
  cms inches cms inches cms inches cms inches
WAIST 70 27 75 29 80 31 85 33
HIPS 95 37 100 39 105 41 110 43
Fabric Composition and Product Care

Fabric Composition:

45% Merino Wool
40% Polyester Thermocool™
10% Polyamide
5% Elastane

Product Care: 

  • Warm machine wash – up to 40 degrees
  • Wash with similar colours
  • Do not tumble dry - Runderwear™ dries fast thanks to the moisture-wicking technical fabric
  • Do not soak, bleach or dry clean

The Merino Runderwear™ range is designed to give you optimum comfort and performance whilst training. The intelligent fabric composition combines ethically sourced high-grade Merino Wool with Thermocool technology which helps keep you cool when you are hot and warm when you are cold. Runderwear™ is designed using 360-degree seamless technology construction to prevent rubbing on the skin when you move. The moisture-wicking technical fabric removes sweat from your skin quickly helping you to stay dry. Chafe-free, guaranteed. 

  • 360-degree seamless technology construction
  • Moisture-wicking transport system
  • High-Grade Merino Wool combined with Thermocool Technology
  • Improved core temperature control
  • Runderwear™ fabric is lightweight and durable.



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    performance underwear
    ★ Read Our Reviews

    Let customers speak for us

    2623 reviews
    H said: Does everything it promises!

    Extremely comfortable to wear, washed well and dried quickly. I was so impressed that I bought another pair

    Nick Brock said: Good to wear

    Great underwear- does what it says on the tin. No chafed or sore areas - even on long runs of over 2 hours. Seamless socks are the best I’ve tried as well. Will be back for more.

    jennifer Bennetts said: Smooth

    Comfortable to run in with no blisters so far.

    EW said: Marathon Tested

    I have to admit that I have run commando for the past 10 years and was always under the impression this was the way to minimize chafing. HOW WRONG WAS I. I ran the Berlin Marathon yesterday in 22 deg heat and I have not a single hot spot. RUNDERWEAR IS THE SOLUTION!

    Paul Baker said: anti blister socks

    The socks do as it says on the label they minimise friction and therefore reduce greatly the risk of blisters....I am 72 years old and use these for a long day in the field metal detecting,walking many miles...well done on a good product.