Which size should I choose?

Choose your usual size: this t-shirt fits true to size. If in doubt, the size guide on the product page gives the height in cm and body weight for each size.

How should I care for them?

Wash at 30 °C maximum without fabric softener and leave to air dry: it dries quickly, so avoid tumble drying.

Can you wear it all year round?

Yes, it’s a t-shirt for all seasons. Worn on its own in warmer weather, it stays breathable and dries quickly; when it’s cooler, it works as a base layer under a jacket.

Can I wear it under a backpack?

Yes, with care. Its fine-knit fabric is more delicate than a heavier fabric: repeated rubbing from backpack straps or a hip belt may leave marks. For heavy loads, choose a thicker t-shirt.

Does it have thumb loops?

No. The long sleeves end at the wrists, without thumb loops.

Does it retain odours?

Our CIMAFRESH technology is an antibacterial treatment that limits odours during activity and is designed to remain effective after several washes. It reduces odours but does not eliminate them.

What is it made from?

It is 100% polyester. As a synthetic t-shirt, its traceability sheet notes that washing releases plastic microfibres.

Garment assembly, weaving or knitting, and dyeing take place in China.

What are the delivery times for this product?

All orders placed by midnight are prepared the next day. In France, orders placed before 1 pm (excluding weekends) with Chronopost 24h are dispatched the same day. Delivery then depends on the carrier and takes 1 to 4 days in France. Delivery times for Europe and the rest of the world vary by destination.

Can I return the item if the size doesn't fit?

Yes, absolutely. You have 30 days to return it and get a refund or an exchange. Return shipping is free. The item must be new, unworn, unwashed, and have its original tag.

Women’s long-sleeved running t-shirt - Boreon LS

49,90 €

12 reviews

Antibacterial

quick-drying

Ultra-light

95 g (size S)

Sky

Delivered from Thu 12 Nov.

Free returns within 30 days

Available in several versions

Men Women

Half-zip Short sleeves Long sleeves Vest

Free repairs for life

By La Réparerie, our repair service.

Complete your outfit

RUN LOW

Merino wool trail socks - low cut

14,90 €

X2-LONG

Double-layer blister-prevention trekking socks

16,90 €

BOREON LS

49,90 €

12 reviews

Delivered from Thu 12 Nov.

Free returns within 30 days

Who did we design it for?

For women who run trails or hike in cool or changeable weather and want a lightweight long-sleeved t-shirt that fits under a jacket.

How much do they weigh?

95g in size S, long sleeves included: a lightweight t-shirt you barely notice when wearing it.

How breathable is it?

Its fine, airy knit lets air circulate, even beneath the long sleeves. It dries quickly.

What makes it different?

Our CIMAFRESH technology is an antibacterial treatment that helps limit odours during activity and is designed to stay effective after repeated washes.

Its performance

Breathability

Drying time

Quick

Lightweight

95g (S)

Stretch

Slightly stretchy fabric

Ideal for

Trail running

Ultra-trail

Fast hiking

Hiking

Long sleeves that let air flow through

In between seasons or at dawn, conditions change quickly: cool air at the start, rising sun and exposed stretches. This t-shirt covers your arms without weighing down your stride.

Its fine, airy knit lets air circulate even under the sleeves and wicks away sweat. An antibacterial treatment helps limit odours, while reflective strips on the sleeves improve visibility at dusk.

Stay comfortable from the first kilometre to the last.

Key features

Protective long sleeves

- Arm protection without added weight or overheating.

Maximum breathability

- Ultra-breathable mesh that efficiently wicks moisture,
- quick-drying to stay dry even during intense effort.

Freedom of movement

- Natural freedom of movement when running,
- Raglan sleeves and shaped seams that move with you.

Reflective elements

- Enhanced visibility during night-time outings.

CIMAFRESH Technology

durable freshness and odour reduction during activity.

Antibacterial action : limits the growth of bacteria responsible for unpleasant odours.
Long-lasting freshness : allows the garment to be worn longer without any feeling of discomfort.
Lasting comfort: treatment* discreet, odourless, without affecting the breathability or feel of the fabric.

CIMAFRESH technology is designed to maintain its effectiveness over time, even after multiple washes, contributing to more durable garment use.

*Antibacterial treatment based on silver chloride (biocidal product).

Details

Specifications

Weight

95g (S)

Brand

Cimalp

Breathability

Total breathability

Fabrics

100% Polyester

Insulation

ALL SEASONS

Size type

Women's Top

Traceability

Product sheet on environmental qualities and characteristics
Manufacturing: China
Weaving/Knitting: China
Dyeing/Printing: China
Releases plastic microfibres into the environment during washing

Complementary products

+11

5 PANEL CAP

Breathable trail running cap

(97)

26,90 €

TEILLON

Warm technical stretch zip sweatshirt - Women

(216)

59,90 €

-30%

SKIN JACKET

Ultralight windproof jacket with hood - Women

(19)

51,90 €

74,90 €

RUN SLEEVES

Thermal forearm arm warmers

(170)

19,90 €

Reviews

4.8

Based on 12 reviews

5

83%

4

8%

3

8%

2

0%

1

0%

Customers recommend the usual size

Comfort

Breathability

Quick-drying

In summary This content is written by AI

Customers appreciate its lightness and comfort, with some describing it as a true second skin. Its breathable technical fabric helps protect against the first cool spells, while the fit and colours are considered very attractive. It is easy to wear both for everyday activities and sport, with a pleasant feel against the skin. Do check the fit, though: one customer found it too tight, while another found the sleeves slightly long. It is especially well suited to outings in cool weather.

Claire G.

Verified customer

Height 160cm Usually wears XS Usage Trail running

Translated review

06/11/2026

Very pleasant t-shirt to wear. It will follow you everywhere like a second skin. Perfect in every way.

Françoise C.

Verified customer

Height 158cm Usually wears M

Translated review

06/11/2026

Everything is perfect with you.

Lingsam T.

Verified customer

Height 150cm Usually wears S Usage Trail running

Translated review

09/11/2026

I ordered this t-shirt in size M even though I usually wear size S (I'm 5'1" and 115 lbs) because I was worried it might run small, and it's the perfect fit for me. This t-shirt is lightweight and perfect for protecting me from the sun in summer.

Milena F.

Verified customer

Height 150cm Usually wears XS Ordered size S Ordered color Vert amande Usage Trail running

Translated review

07/10/2026

Ultra-lightweight t-shirt, excellent breathable technical fabric. Beautiful cut and color, sleeves a bit long for the size.

Marie D.

Verified customer

Height 174cm Usually wears S Usage Marche nordique

Translated review

06/11/2026

Great shirt. I'd love to see the same t-shirt with a V-neck and in beige, for example, a more versatile color.