Our technical fabrics guarantee the highest quality for customising running and athletics garments.
42K's commitment is to offer clubs, teams and groups high-performance sportswear. We work hard to meet the highest expectations of the most demanding athletes.

Soft'n'Fit:
Firmness, precise fit and comfort Soft’n’Fit is a technical fabric for high-performance compression garments. Made of 92% nylon and 8% spandex, it offers a well-judged combination of firmness and stretch that guarantees a precise, stable and enveloping fit, much like a second skin.
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UrbanDry: Lightness and strength for everyday wear.
UrbanDry Technical fabric in 100% recycled polyester, lightweight and hard-wearing, designed for active everyday use. It combines comfort, durability and an urban look with sporting DNA.
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WINTRY FLEX: Thermal insulation, lightness and durability
The WINTRY FLEX technical fabric is used to make sports garments that must offer effective insulation against moderate cold or damp, while providing an optimal combination of lightness, strength and durability. Its properties of thermal insulation, lightness and high resistance to wear under intensive use give it optimal qualities for making sweatshirts or sports jackets that can be worn comfortably and versatily before and after training, but also for outdoor training in cool or damp temperatures. Its composition of 100% polyester at 210 grams per square metre makes it a perfect fabric for making garments that guarantee a feeling of lightness and flexibility for outdoor activities. It is a fabric with a soft feel that is easy to care for, which together with its resistance to wear makes it perfect for use in everyday garments. Its high-durability structure ensures garments keep their shape and performance after many wears.
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FLEXER Pro: Second skin
42K's Flexer Pro fabric is made of 72% high-quality polyester and 28% elastane, a textile fibre that adds stretch and is of great importance in sports garments demanding a full body fit without penalising freedom of movement. Polyester provides lightness, durability and good breathability, while the proportion of elastane in this fabric provides excellent stretch to ensure a perfect fit and maximum comfort during high-intensity sport. Flexer Pro fabric ensures garments fit the body like a second skin, favouring an optimal fit so you can perform at your best in training and competition. This fabric is used to make garments (tights, competition briefs, tops and arm sleeves) for athletics clubs and competition squads in the CUSTOM section.

FLEXER: Sustainability and functionality
42K's Flexer fabric is made of 88% high-quality recycled polyester and 12% elastane, a textile fibre that adds stretch, a quality of great importance in certain sports garments. Recycled polyester, obtained from reused materials, ensures lightness, durability and good breathability. Elastane provides the stretch needed for a perfect, comfortable fit, guaranteeing total freedom of movement. Flexer fabric combines sustainability with functionality, giving life to garments that fit the body without limiting movement and delivering optimal performance in training and competition. This fabric is used to make our running tights and competition briefs from the 4TRACK collection.


INFINI_TECH: 42K's first 100% recycled fabric
INFINI_TECH is a 100% recycled technical fabric, made with polyester yarn from used plastic bottles. With a 120 g/m² weight, it stands out for its lightness, softness and high breathability, offering excellent comfort and freedom of movement even under intensive use. These qualities make it a fabric especially suited to technical running garments. Each T-shirt made with INFINI_TECH uses an amount of recycled material equivalent to approximately 20 plastic bottles of 500 ml, combining sports performance with less use of virgin raw materials.
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Neo-Tec 100% recycled: Long-lasting technical performance with extra thermal protection
Neo-Tec 100% recycled guarantees long-lasting technical performance thanks to its 140 g/m² weight. It offers extra resistance to intensive use as well as extra thermal protection. This fabric is made with polyester yarn from recycled used plastic bottles.
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PES ELASTIC: Thermal protection, stretch and strength
PES ELASTIC is a brushed technical fabric used to make the 42K technical sweatshirts thanks to its excellent performance for sport on cold, damp days. It is a fabric that guarantees thermal protection with the right breathability, which makes it ideal for creating sportswear for temperatures below +5º. It is a highly resistant stretch fabric that does not lose its shape and is easy to clean. This fabric allows full customisation through digital sublimation.
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DrySilk: Softness, lightness and fast drying
DrySilk is a technical fabric that stands out for its outstanding softness and lightness, with the right amount of stretch that makes it ideal for garments demanding great freedom of movement, such as running shorts. DrySilk fabric guarantees optimal technical performance in intensive use thanks to its softness (so important in garments like running shorts), its lightness and its fast drying, thanks in turn to its exceptional breathability.

Resistex: The perfect balance of lightness and strength
ResisTex is a technical fabric that, thanks to its compact, lightweight construction, stands out for its good strength and is perfect for making technical garments destined for intensive use. ResisTex is the fabric we use to bring our technical polo shirt to life, a garment that can be worn for a casual-sport look but is also ideal for various sporting activities such as padel, tennis, golf, Nordic walking, trekking...). ResisTex is a fabric that combines good strength and durability with the right breathability to create garments with a casual cut but with the lightness, fast drying and comfort demanded of clearly sporting pieces.
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ReSport: 100% recycled tubular fabric
Resport is a fabric made with 100% recycled Repreve® polyester fibre. It is a high-quality recycled polyester that guarantees a pleasant feeling of softness and comfort. It is perfect for bringing to life garments that have to be in contact with sensitive areas such as the neck or the face. Resport tubular fabric is used to create our technical bandanas, an accessory highly valued by runners for the excellent comfort it offers thanks to its stretch, softness and warmth across its many uses.
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