The APRÍ Learning Hub — Guides on Sustainable Activewear, Anti-Odour Technology, and Fabrics
Everything we know about what makes activewear genuinely better — from the science of gym clothes odour to the difference between OEKO-TEX and GOTS, explained clearly and without the marketing language.
Anti-Odour Technology
Why Do Gym Clothes Still Smell After Washing?
The science behind why synthetic activewear develops persistent odour — and why plant-based technology solves the problem where silver ions fall short.
HeiQ Mint Explained — The Technology Behind APRÍtech™
What HeiQ Mint is, how it prevents bacterial activity without heavy metals, and why it retains 94%+ effectiveness after 20 washes.
What is NordShield? The Biodegradable Technology in APRÍshield™
Nordic wood extractives turned into a textile finish. Biodegradable, free from biocides, rooted in Scandinavian materials research.
Silver, Zinc, and PFAS in Sportswear — What You Should Know
The industry standard anti-odour approaches come with environmental costs most brands don't advertise. Here's the evidence.
Fabrics and Materials
What is Lyocell? The Sustainable Fabric That's Actually Better for Workouts
Made from wood pulp in a closed-loop process. Softer than polyester, more moisture-intelligent than cotton, naturally odour-resistant.
Lyocell vs Polyester — Which Fabric Is Actually Better for Working Out?
An honest performance comparison across moisture management, odour resistance, feel, durability, and environmental footprint.
Lyocell Polo Shirts — Why TENCEL Makes the Best Polo for Sport and Everyday Wear
Cotton becomes waterlogged. Synthetic polos develop odour. Here is why Lyocell solves both problems at once.
Microplastics from Workout Clothes — What You Should Know
Every wash of synthetic activewear releases hundreds of thousands of microplastic fibres. Which fabrics are responsible and what you can do.
Sustainability and Certifications
OEKO-TEX, GOTS, and Bluesign — What Certifications Actually Mean
Three certifications. Three different things they test. What each guarantees, what it does not cover, and how to use them to evaluate a brand.
How Often Should You Wash Workout Clothes?
Washing every time degrades fabric, releases microplastics, and wastes energy. Here is what the science says about washing frequency.
Brand and Production
Scandinavian Activewear — Why Nordic Design Makes Better Workout Clothes
Form follows function. Timelessness over trend. Honesty about materials. The Scandinavian design principles that shaped APRI.
Why Portugal Makes Some of Europe's Best Sportswear
Portugal has become Europe premier activewear manufacturing destination. The technical capability, sustainability credentials, and supply chain transparency behind that claim.
Frequently Asked Questions
Why do gym clothes smell even after washing?
Workout clothes smell after washing because synthetic fabrics like polyester have a rough microscopic surface that traps odour-causing bacteria deep inside the fibres. Standard detergent cannot fully reach them, particularly at lower wash temperatures. When you sweat again, the bacteria reactivate and break down compounds in perspiration into volatile organic compounds — the familiar post-workout smell. The fix is either switching to smoother, naturally odour-resistant fibres like Lyocell, or using plant-based anti-odour treatments such as HeiQ Mint or NordShield that prevent bacterial activity on the fabric itself.
What is the best anti-odour technology in sportswear?
The most effective anti-odour technologies are plant-based treatments such as HeiQ Mint (peppermint-derived) and NordShield (from Nordic wood extractives). Both are free from silver, zinc and other heavy metals, and independent testing shows they retain more than 94% of their effectiveness after 20 wash cycles at 30°C. They outperform silver-ion treatments, which wash out over time and release heavy metals into waterways. Best results come from combining a plant-based treatment with a naturally odour-resistant fabric such as TENCEL™ Lyocell.
Is HeiQ Mint safe to wear against skin?
Yes. HeiQ Mint is plant-based, derived from peppermint, with no silver, zinc or other heavy metals in contact with the skin. APRÍ garments treated with HeiQ Mint are certified to OEKO-TEX Standard 100, which independently tests for more than 100 harmful substances and confirms safety for direct, prolonged skin contact. They also meet GOTS and Bluesign requirements. For people with sensitive skin, the plant-based nature of HeiQ Mint is a meaningful advantage over metal-ion antimicrobial treatments.
What is NordShield?
NordShield is a Nordic anti-odour textile technology made from wood extractives — natural antimicrobial compounds including tannins and phenolic acids found in Scandinavian wood species such as pine, spruce and birch. NordShield isolates and stabilises them into a durable fabric treatment that makes garment surfaces inhospitable to odour-causing bacteria. The raw materials are a byproduct of Nordic timber and paper processing. NordShield is fully biodegradable, free from silver, zinc and synthetic biocides, and is used in APRÍ's APRÍshield™ collection.
Is lyocell good for workout clothes?
Yes. Lyocell fibres are smoother than polyester, so bacteria have far less surface area to colonise and garments resist odour naturally. Lyocell absorbs moisture and releases it evenly across the fabric, keeping you drier during exercise without the waterlogged feel of cotton. It is soft, hypoallergenic and produces no microplastic shedding. APRÍ uses TENCEL™ Lyocell as the foundation of its collection, combined with plant-based anti-odour treatment for longer freshness between washes.
How is lyocell different from polyester?
Lyocell is a natural fibre made from wood pulp in a closed-loop production process; polyester is synthetic and made from petroleum. Polyester is hydrophobic and wicks moisture but its pitted fibre surface traps odour-causing bacteria deep inside the fabric. Lyocell is hydrophilic, absorbing and releasing moisture evenly, and its smooth fibres naturally resist bacterial colonisation. Polyester also sheds hundreds of thousands of microplastic fibres per wash and does not biodegrade. Lyocell sheds no microplastics and breaks down naturally at end of life.
What does OEKO-TEX certified mean?
OEKO-TEX Standard 100 is a product-level certification that tests finished textiles for more than 100 harmful substances, including heavy metals, pesticide residues, certain PFAS compounds, formaldehyde, allergenic dyes and biocides. Every component of a certified garment — fabric, lining, labels, zippers, thread — must test clean. The OEKO-TEX 100 label verifies that the finished product is safe for direct, prolonged skin contact. It does not cover supply chain ethics or manufacturing sustainability — those are addressed by GOTS and Bluesign.
Is GOTS the same as organic?
Not exactly. GOTS (Global Organic Textile Standard) requires organic raw materials as part of a broader standard, but it goes further than most organic labels. To be GOTS certified, at least 70% of textile content must be certified organic fibres (95% for the top organic tier), all chemical inputs must meet strict environmental and toxicological criteria, wastewater treatment standards must be met, and social standards based on ILO conventions must be audited through the supply chain. So GOTS is more comprehensive than simply organic — it covers the fibre, the processing and the labour behind it.
More guides added regularly. Questions? Get in touch