Collection: Longsleeve T-shirts Round Neck

Longsleeve T-shirts round neck from Undiemeister: stylishly layered, comfortably complete

Not too thick, not too light, just perfectly balanced. A longsleeve T-shirt round neck is that one garment you can count on at any time of the year. As a light sweater, as a discreet base layer or simply as a stylish, minimalist top.

At Undiemeister, we make the longsleeve as you would expect: with attention to fit, breathability, temperature regulation and finish. Not standard basics, but masterful essentials made from our patented Mellowood blend.

Why a round neck longsleeve T-shirt?

It's the perfect middle ground between a basic T-shirt and a sweater. This shirt:

• Gives you that extra bit of warmth
• Keeps your body temperature stable
• Offers the freedom of a T-shirt, with the coverage of long sleeves
• Is stylish solo and subtle under other clothing
• Pairs effortlessly with jeans, chinos or even shorts

A round neck longsleeve is functional, but also exudes class. Especially if it is made of Mellowood.

One garment with multiple uses.

Mellowood: the secret behind the ultimate wearing comfort

The fabric of all our longsleeves is made of:

• 68% TENCEL™ Modal
• 28% Organic cotton
• 4% Elastane

This unique blend, patented as Mellowood, offers you:

• Silky soft touch, even for sensitive skin
• Optimal stretch without lubbing
• Airy warmth, never oppressive
• Fast drying in case of moisture
• Shape retention, even after frequent washing

It feels like luxury, it works like performancewear, it stays like quality.

Always fresh and dry, even with long sleeves

You would think that long sleeves are warmer, true, but they should never be too warm. Thanks to Mellowood, this shirt stays:

• Breathable, air circulates naturally
• Odour-free, thanks to the antibacterial properties of TENCEL™ Modal
• Moisture regulating, sweat evaporates quickly
• Lightweight, no heavy or sticky feeling

So you have the benefits of a sweater, but the comfort of your favourite T-shirt.

Your skin stays dry, your look stays sleek, your day stays smooth.

Fit and finish: tight where needed, relaxed where allowed

Our round neck longsleeve T-shirts are:

• Available in slim fit
• Designed with subtle, round neckline
• Made with extra length, so they stay in your trousers
• Finished without inner tags or irritating stitching
• Available in sizes S to XXXL

And of course in timeless colours like:

• Black (Volcano Ash)
• White (Chalk White)

Think less about what you wear, more about how it feels.

What situations is this shirt ideal for?

The round neck longsleeve from Undiemeister effortlessly adapts to your day. Wear it:

• As a standalone top on jeans or chinos
• Under a jacket or cardigan as an undershirt
• When traveling, airy, compact, odour-free
• During meetings or casual Fridays
• In sporty or active moments, the shirt moves with you

Layered or solo, relaxed or tight, this shirt feels at home everywhere.

Sustainability as a fixture

• TENCEL™ Modal from FSC-certified forests
• Organic cotton, skin-friendly and chemical-free
• CO₂-neutral production in Europe
• No microplastics, no unnecessary coatings
• Plastic-free, fully recyclable packaging

At Undiemeister, every garment is consciously designed, for you and for the world.

Order smart, order a bundle

Our longsleeves round neck are available in:

• Singular pieces, to try the quality easily
• 3-packs, for everyday convenience
• 6-packs, for when you know what you want

Always prepared, always in style, always in stock.

Order your new favourite round neck long sleeve today

• Made of 68% TENCEL™ Modal, 28% organic cotton, 4% elastane
• Round neck, long sleeves and slim fit
• Breathable, odour controlling, temperature regulating
• Sustainably produced in Europe
• Available in multipacks or individually

One shirt, endless uses. This is your new favourite.

The longsleeve you choose every day

Undiemeister's longsleeve round neck T-shirts are not just basics. They are silent staples in your wardrobe: stylish, functional, comfortable and smart. For men who know that the power is in simplicity, but only when it is perfectly executed.