Inner Mettle products ship worldwide, import duties and taxes are included for the USA, UK and Canada.
Shipping costs vary by location and are visible during the checkout process.
You can return apparel within 30 days of purchase within the USA, UK and Canada. Return shipping is at own cost for all other markets, please view our returns policyhere.
Women’s Sizing Chart
Why BioPerform Sportswear?
Most performance activewear is bad for your health
Even the more sustainable options, such as recycled polyester and plastic bottles, release toxic chemicals as we sweat and wash our clothes. Not the ideal choice for clothes we wash repeatedly and wear directly next to our skin.
Bio-based polyamides boast performance factors that are typically reserved for plastic-based fabrics such as polyester
IM BioPerform offers an unmatched combination of performance factors that you won’t find in other eco alternatives to polyester such as cotton, bamboo or even tencel.
Bio-based polyamides use less resources
No impact on food chain (human or animal) • Life cycle assessment low impact on climate change (-25%)*
Reduced water consumption (-20%)* • Reduced CO2 emissions (-20%)*
*compared to standard polyamides
Made from a renewable resource - Castor Beans
The castor bean plant grows in arid areas with minimal requirements for water or chemicals, and produces castor beans which contain up to 50% oil. Fibers sourced from the castor bean oil are 100% renewable, petroleum-free and plastic-free.
Free from toxic chemicals
Apparel made from bio-based polyamides are free from added chemicals that harm your health and that of the environment.
of a world free from plastic
Did you know that synthetic fibres represent the largest share of land based man-made microplastics which end up in the oceans?
Between 600,000 and 17,700,000 microplastic fibers get washed down the drain in every 5kg washing machine load of synthetic clothing. We also breathe in these fibres as they rub off our clothing during wear, and when heated such as in strong UV light. Plastic particles end up in the air and humans breathe them in.
Frequently asked questions
Why wear IM BioPerform sportswear?
IM BioPerform offers an unmatched combination of performance factors that you won’t find in other eco alternatives to polyester such as cotton, bamboo or even tencel. Feel free to run faster, jump higher and sweat more - BioPerform has you covered.
Most performance activewear is bad for our skin and health because it’s made using petroleum and plastics. Even the more sustainable options, such as recycled polyester and plastic bottles, release toxic chemicals as we sweat and wash our clothes. Not the ideal choice for clothes we wash repeatedly and wear directly next to our skin.
Can I expect any shrinkage to my sportswear?
If you follow the care instructions on the label your sportswear will keep their general shape and size. The garment may shrink a few centimeters once washed but that does not compromise fit because of the high elasticity.
Is BioPerform sportswear vegan friendly?
Bioform is made using a natural polyamide that comes from castor beans! There are no animal products used in the making of our sportswear.
Can I return my order if it is the wrong size?
If you’ve made a mistake with the sizing, you can exchange your item within 30 days. View our exchange policy here. Please contact customer service to arrange firstname.lastname@example.org
Which countries does BioPerform sportswear ship to?
Inner Mettle products ship worldwide, import duties and taxes are included for the USA, Canada and UK. Shipping costs are visible during the checkout process.
Why do you manufacture BioPerform in R.N. Macedonia?
R.N. Macedonia has a long tradition in the textiles industry and is closely connected to Europe. R.N. Macedonia’s textile industry is the second largest export industry in the country and exports mainly to EU countries. Textile factories in R.N. Macedonia are known for their quality and professionalism. Please view more details about Inner Mettle’s Manufacturing on our Mindful Manufacturing page.
How do I care for my BioPerform sportswear?
BioPerform leggings can be laundered at home using hot water and regular home detergent, or by your commercial laundry service provider, in an open pocket washer/extractor. Do not launder in commercial tunnel washers. Do not use any fabric softeners. Do not use chlorine bleach as it may degrade the fabric over time.
We’re donating 5% of profits to the Founder’s Pledge Climate Change Fund.
Join the Inner Mettle community
Get a discount code for your first purchase plus notifications about exclusive offers, events, new products and more.