Best selling Functional underwear

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 Men X-Plorer Energizer 4.0 Pants

The 3D Bionic Sphere System with ThermoSyphon technology maintains the perfect body temperature of 37°C in any situation to ensure optimal performance at all times. Only with X-BIONIC 4.0: Innovative Retina Ultra-High-Resolution, award-winning, patented 3D Bionic Sphere System with ThermoSyphon technology. Featuring complex 3D structures with internal and external air channels. It cools when you sweat and warms you when you feel cold. The Sorestopper texture ensures highly efficient heat distribution. 100% pure Swiss development. Made in Italy. Over 700 international awards and test victories, with more than 800 patent applications for products marked with "X". 

2. X-Bionic Invent 4.0 Run Speed

Is running your passion? With the X-BIONIC® Invent 4.0 Running Speed Shorts for women, you can rely on high-tech comfort to enhance your performance. The lightweight models from the X-BIONIC® 4.0 generation are specifically designed for female runners.

The shorts are equipped with ultra-high-resolution Retina® technology and feature precisely targeted functional areas for performance-enhancing temperature regulation.

The Two-Step Front 3D Bionic Sphere® System at the lower abdomen and the optimized 3D Bionic Sphere® System at the tailbone are highly active areas that ensure effective temperature balance in the ultra-thick knit fabric.

The proven Innerlap Airconditioning Zone on the inner thighs and the targeted insulation of the Iso-Pads provide optimal climate and wearing comfort.
 

3. Lenz Heat pants R2H 2.0

The heated pants of the Lenz Body Heat System fit comfortably under any trousers, whether casual or sportswear, thanks to their slim design. The heating elements are not noticeable in the front thigh area and provide a pleasant warmth. The lithium packs are attached above the waistband and, depending on the battery type, can provide warmth for up to 11 hours. 

Lenz Heat pants R2H 2.0
Functional underwear
−30%
only 1 piece on sale
CHF118.– was CHF168.–

Lenz Heat pants R2H 2.0

4. X-Bionic Energizer 4.0

With their moderate compression, the Energizer 4.0 Pants by X-Bionic meet all the demands of discerning winter sports enthusiasts who want to benefit from outstanding wearing comfort and performance-enhancing thermoregulation. They are made from an ultra-dense knit that incorporates 13 highly effective technologies. Functional zones with temperature-regulating and protective effects are precisely positioned to support your performance on cool winter days without feeling constricted. The legendary patented 3D Bionic Sphere System is enhanced by ThermoSyphon technology: complex 3D structures and Y-shaped elements maximize air exchange, cooling you when you sweat and warming you when you’re cold - now faster and more efficiently than ever. Retina Ultra-High-Definition quality. 

5. Ortovox Women's Fleece Light Short Pants

The Fleece Light Short Pants for women keep you pleasantly warm on icy days while freeriding or ski touring.

The Tasmanian merino wool, with its fine wool fibers,
makes the lightweight ¾ pants particularly soft and provides a comfortable feel against the skin. On the inside, a special waffle structure ensures optimal moisture transport, resulting in a warm, dry sensation—even in extreme cold and after strenuous ascents.

Thanks to its regular-fit design and high stretch capability, the lightweight three-quarter pants offer ideal wearing comfort. The elastic waistband ensures that the Fleece Light Short Pants for women fit perfectly even during intense activities. A snug, functional companion for cold touring and freeride days in alpine terrain!.
 

6. X-Bionic Invent 4.0 Women's functional underwear

With the Invent 4.0 Pants from X-Bionic, you benefit from a significant performance boost from your very first steps into the world of winter sports. This functional underwear is designed for women who desire light compression and effective thermoregulation for a moderate level of activity. It is made from a very dense material, in which the functional zones are seamlessly integrated and can work precisely. The legendary 3D Bionic Sphere System ensures optimal thermoregulation in the front area and at the tailbone with proven effectiveness. Sweat traps prevent sweat streaks and further enhance the cooling effect. The ExpansionKnee at the knee joint offers optimal climate comfort while allowing unrestricted freedom of movement.

- Retina Ultra-High-Definition quality

- Perfect fit due to Active Waistband and IDEO waistband.
 

7. Compressport Seamless Boxer M

Developed at the request of our athletes, these boxer shorts offer superior comfort thanks to the ultra-soft microfiber material. Highly breathable, they quickly wick away sweat and moisture to keep you feeling fresh at all times. A lighter fabric on the sides offers additional ventilation. The ergonomic seamless fit hugs the hips like a second skin to prevent uncomfortable chafing. The flat seams offer two advantages: they prevent chafing and remain invisible under clothing. The wide elastic waistband is very comfortable and stays in place. The specific design allows for optimal freedom of movement during exercise. 

8. Ortovox 230 Competition Long Pants

The 230 Competition Long Pants for men help you achieve peak athletic performance in a new look – whether skiing, freeriding, or on high-altitude tours. The 230 Competition line is seamlessly crafted using circular knitting to provide the right thickness of merino wool for every body zone during exertion and cold. The ribbed structure with 190 g/m² merino gives the functional shirt elasticity for maximum freedom of movement. A particularly breathable mesh structure is used in heat spots, while the 240 g/m² thick wool warms sensitive areas like the lower back. This body mapping principle ensures a close fit with maximum ventilation. The fine merino fibers, with a diameter of only 16.5 microns, feel pleasantly soft against the skin, and the functional shirt is also quick-drying and highly durable. The new gradient from light to dark is created by knitting in melange yarn, giving the functional shirt a unique pattern thanks to the body mapping structure. Thus, the 230 Competition Long Pants for men also visually perform at their best!. 

9. SAXX Underwear Ultra Boxer Brief Fly 3 Pack

The Men's Ultra Boxer Brief Fly 3-Pack from SAXX Underwear is the perfect companion for your mountain sports activities.

10. Ortovox Women's 230 Competition Long Pants

The 230 Competition Long Pants for women help you achieve peak athletic performance in a new look—whether you're ski touring, freeriding, or on a high-altitude trek. The 230 Competition line is seamlessly crafted using circular knitting to ensure that every body zone is catered to with the right thickness of merino wool during exertion and cold. The ribbed structure with 190 g/m² merino provides the functional shirt with elasticity for maximum freedom of movement. A particularly breathable mesh structure is used in heat spots, while the 240 g/m² thick wool warms sensitive areas like the lower back. This body mapping principle ensures a close fit with maximum ventilation. The fine merino fibers, with a diameter of just 16.5 microns, feel pleasantly soft against the skin, and the functional shirt is also quick-drying and highly durable. The new gradient from light to dark is created by knitting in mélange yarn, giving the functional shirt a unique pattern thanks to the body mapping structure. The 230 Competition Long Pants for women thus also excels visually!. 

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