Klattermusen Men's Groa Igneous SS Tee

Established in 1975, Klättermusen continues to push the balance between performance, durability and environmental responsibility, creating refined pieces built for demanding conditions.

The Klättermusen Groa Igneous Short Sleeve Tee is a lightweight, technical layer designed for high-output movement in warm environments. Built using an ultralight Lignum mesh construction, it combines Tencel™ (lyocell) and recycled polyester to deliver exceptional breathability alongside fast-drying performance.

The fabric feels soft against the skin while efficiently managing moisture, making it ideal for everything from steep climbs to fast-paced trail efforts. A raglan sleeve construction enhances freedom of movement, while the shifted side seams reduce friction and create a cleaner, more comfortable fit during sustained activity.

Reflective detailing on the front and back improves visibility in low-light conditions, while the distinctive print adds a subtle technical aesthetic.

Purpose-built for movement, the Groa Igneous Tee is a versatile warm-weather layer that prioritises airflow, comfort and efficiency.

• Soft and quick drying material made out of tencel and polyester
• Front and back prints with reflective branding
• The side seam is moved towards the back for a seamless feel
• Raglan sleeve for free movement
• Fabric Composition: 20% Polyester / 80% Lyocell
• Made In: Bangladesh
• Colourway: Raven
• Product Code: 10660-961

All sizes displayed on our website are UK sizes.

We are currently working on measurements for apparel and accessories so please bear with us.

In the meantime, for footwear, please refer to the sizing guide here. However, if you require any additional advice on sizing, please contact us.

Worldwide shipping, domestic shipping in the UK, and in-store collection is available.

You can find all relevant shipping information here.

We have a 28-day return policy, which means you have 28 days after receiving your item to request a return. 

To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.