New for Women
Shop NowBest summer running shorts
"My favourite running shorts! These got me through a summer of 35 degree heat training for a marathon. I had to go back and buy more colours!"
Free standard shipping for orders above £40
Free returns
CHF 95.90
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CHF 95.90
Technical, lightweight running shorts built with intelligent body-mapped ventilation for high-intensity temperature regulation, the Merino 125 ZoneKnit™ Speed 3” Shorts feature our breathable Cool-Lite™ fabric blend.
Good for:
Main body: 80% TENCEL™ Lyocell, 20% merino wool/ mesh: 60% TENCEL™ Lyocell, 40% merino wool/ lining: 60% TENCEL™ Lyocell, 40% merino wool, exclusive of decoration
Machine wash cold, gentle cycle. Wash with like colors. Do not use softener. Do not bleach. Do not tumble dry. Line dry in shade. Cool iron. Do not dry clean.
Model measurements:
Height: 180cm / 5'11''. Waist: 65cm / 25". Joice is wearing size S.
Key product measurements:
Inseam Length:8cm (Based on size M)
Regular Fit
Neither snug nor loose - garments that are worn solo or over other layers.
Standard delivery: free for all order over £ 40. Delivery in 5-7 days, from Monday to Saturday, during working hours.
Please visit our Delivery page and find out more about the ways in which you can receive our products.
You have 30 days from delivery to follow our quick and easy return procedure.
Overall rating: 4.6666665 / 5 from 27 reviews.
Review topics: ["fit","material","fabric","shorts","pair","rise","synthetics","merino","buy","pockets","clothing"].
"My favourite running shorts! These got me through a summer of 35 degree heat training for a marathon. I had to go back and buy more colours!"
— Callie (5/5)
"I’ve never owned shorts that don’t ride up that aren’t spandex. These are by far the most comfortable running shorts. So glade to find a pair that aren’t synthetic. Way to go icebreaker!!! I’ve run in these shorts several times now. I wash all my cloths on delicate use general detergents and always hang dry. The fit is perfect. Love the material no more synthetics."
— Jessica c. (5/5)
"Excellent running shorts! At last an all natural fabrics pair without the microplastics. These are comfortable and move with you. I am typically a size small, and these in a small fit me a little looser than the model pictured, but I like the fit. I don't prefer the reflector strips on the back hem, but I was able to remove them."
— Lisa (5/5)
"So light and airy, so comfortable. I love these shorts. Thank you Icebreaker for making running shorts that are made of natural fibers. Please keep making athletic clothing with zero plastic."
— Chloe J. (5/5)
"Have not worn any other shorts since switching to these. Have 2 pairs and they are perfect. Running, yoga, travel, kayaking, travel in warm places, they dd it all."
— Katherine P. (5/5)
"These shorts are lightweight and comfortable. They don't have stretch so may not be the best gym option. Have found them amazing for wearing around town, going for walks, and hiking."
— Kris (5/5)
"I absolutely love these things. Had a pair 14 years ago which ended up becoming torn due to so much wear, honestly I did not know icebreaker was still around, would've ordered them a long time ago. Seriously the most comfortable pair of clothing I own. Don't really have to wash them much either, they do not stink even after repeated wear. Love love love!!!!"
— Amy (5/5)
"Absolutely love these shorts but after a few runs and washes they have completely shredded apart. Would love to give 5 stars but it looks like they were eaten by a shark after a few long runs"
— Mariana (2/5)
"Upon trying these shorts on, I didn't want to take them off. These are soft and technical. Way to go, Icebreaker. Another amazing product!!!"
— Tif (5/5)
"These are the best shorts for court play in warm weather. So light and airy. Great fit. I have the green and last year's orange. Please add new colours as soon as you can! Something with blue or even pink would be perfect"
— Yoyomum (5/5)
Find the size that fits you best based on people just like you.

Use the chart below to determine your size. If you’re between two sizes, order the smaller size for a tighter fit or the larger size for a looser fit. If your measurements for chest and waist correspond to two different sizes, order the size indicated by your chest measurement for tops and your hip measurement for pants.
Sizing charts:
| XS | S | M | L | XL | XXL | |
|---|---|---|---|---|---|---|
| Waist | 24-26 | 26-28 | 28-30.5 | 30.5-33 | 33-36 | 36-40 |
| Hip | 33-35.5 | 35.5-38 | 38-40 | 40-42.5 | 42.5-45 | 45-48.5 |
| XS | S | M | L | XL | XXL | |
|---|---|---|---|---|---|---|
| Waist | 61-66 | 66-71 | 71-77 | 77-84 | 84-91 | 91-101 |
| Hip | 84-90 | 90-96 | 96-102 | 102-108 | 108-114 | 114-123 |
*Looking for the inseam length? Please refer to the product page to find out.
Our three different fits - slim, regular, and relaxed - ensure that when worn together, layers move and breathe like a single garment.




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