Best selling Functional undershirts

Here's a ranking of the best products in this category. To give you a quick overview, we've also added some key information about the products.

1. X-Bionic Invent 4.0

The intelligent X-BIONIC® INVENT® LT Singlet for men counteracts the risk of overheating. It cools when you sweat and warms when you are cold. Wear it while running, cycling, trekking, or during any other athletic activity. Feel more powerful and comfortably temperate.

The integrated 3D Bionic Sphere® System cools when you sweat and warms when you are cold. Sleeveless, pleasantly close-fitting, and with a beneficially thin structure, this singlet can be worn under your sportswear without adding bulk. All you feel is exactly the cooling effect you desire on warm days. 

2. X-Bionic Invent LT

In warm weather and during sporting activity, the body is at risk of overheating. The result is a loss of performance. This is because 90% of heat regulation in humans takes place through the skin. Invent Summerlight counteracts the risk of overheating and was created by the X-Bionic developers especially for use in the warm summer months. Worn directly against the skin, it develops its air-conditioning effect depending on the intensity of movement. It cools when you sweat and warms when you are cold.Air-Conditioning ChannelThe Air-Conditioning Channel in the chest area is part of the climate channel system. Physiological studies have shown that the chest area is an optimal zone for effective and rapid air conditioning. Without the impression of "cold" spreading through the body, the exchange of fresh air via this channel system cools the chest area. The constant movement of air along the air conditioning channel also effectively draws moisture out of the sweat zones and transports it away.Sweat trapsAbsorb moisture before it can be felt. They lead to evaporation and dispose of it through the dynamics of heat. What remains on the skin is an imperceptible film of moisture that cools. 

3. GripGrab Baselayer

The sleeveless GripGrab Ultralight Mesh undershirt is a must-have for rides on hot summer days. The open mesh material allows your skin to breathe while simultaneously wicking moisture away from your body, keeping you dry and comfortable. The minimal volume and seams ensure maximum breathability – the foundation for excellent comfort and outstanding performance when you're pushing hard in the summer heat. 

4. iXS 365

Seamless circular knitting technology for highest wearing comfort. Ergonomic fit avoids unnecessary creasing. Drains moisture away from the body and keeps the body dry. Functional fibres and special knitting technology ensure an optimum body climate. Suitable all year round, keeps you warm on cold days and cool on warm days. 

5. Merino & More Casual T-shirt

Functional shirt made from merino wool & Tencel: breathable, odour-inhibiting, temperature-regulating and quick-drying. Perfect for sport, outdoor, everyday life & work - soft, light & sustainable. 

6. Forclaz Travel 500

In this merino wool T-shirt, you can explore the world comfortably on multi-week trips. Odor-resistant fabric: ideal for trekking journeys.

7. Icebreaker Core

The Merino Core Short Sleeve Tee is a streamlined t-shirt with a classic fit, made from a blend of sustainable Tencel and natural Merino wool. It offers optimal breathability, comfort and odour resistance for everyday adventures. 

8. Ortovox Merino

With its asymmetric look, the 120 Merino Tec line is ready for rugged peaks and steep walls. Thanks to the athletic, close-fitting cut, the 120 Tec T-shirt for women gives you maximum freedom of movement - no matter how demanding the move. However, the casual T-shirt for women not only cuts a fine figure when climbing, but also accompanies you on any alpine adventure in the mountains. The 120 Tec T-shirt line is therefore perfect for your alpine summer. The proven yarn construction provides the necessary stability and protection against abrasion: Thanks to the core spun technology, the fabric is particularly light yet hard-wearing. In this spinning process, Tasmanian merino fibres with a delicate 17.5 micron fibre diameter are spun around a core of polyamide filaments. This creates a yarn that can be used to produce fabrics that are thin, light and elastic, but at the same time extremely robust and stable. The Tasmanian wool also ensures the proven climate and wearing comfort. The 120 Tec T-shirt for women is therefore the perfect climbing top for your alpine summer. 

9. Ortovox 120 TEC T-SHIRT W

The alpine summer is calling! With its asymmetrical look, the 120 MERINO TEC line is ready for rugged summits and steep rock faces.

Thanks to its snug, athletic cut, the 120 TEC T-SHIRT for women gives you maximum freedom of movement - during even the most demanding of maneuvers. The casual t-shirt for women not only cuts a fine figure while climbing - it's also the perfect companion for any alpine adventure in the mountains. The 120 TEC T-SHIRT is therefore perfect for summer in the Alps. 

The tried-and-tested yarn construction guarantees the necessary stability and scuff protection:  The material is particularly lightweight yet durable thanks to CORESPUN TECHNOLOGY BY THE © SÜDWOLLE GROUP. In this spinning process, soft Tasmanian merino fibers with a diameter of 17.5 microns are spun around a core of polyamide filaments. This creates a yarn perfect for fabrics that are thin, lightweight and elastic, yet extremely robust and sturdy. And Tasmanian wool ensures the customary comfort and a proven microclimate. The 120 TEC t-shirt for women is thus the ideal top for summer climbing in the Alps. 

10. Meru Bustos Merino

The Bustos Merino functional shirt by Meru is a high-quality top specifically designed for active adults. Made from a combination of merino wool and synthetic fibers, it offers excellent breathability and ensures a comfortable wearing experience, even during intense activities. The regular fit provides freedom of movement and comfort, while the odor-resistant properties of the material keep the shirt fresh even after prolonged wear. The simple, solid dark green design makes it a versatile piece that can easily be paired with other items. Additionally, the shirt dries quickly, making it ideal for outdoor activities or sports. Whether hiking, exercising, or enjoying leisure time, the Bustos Merino functional shirt is a practical choice for those who value functionality and style. 

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