Athletic performance meets well-being. We created IM BioPerform because we saw a need for quality performance activewear without the nasty microplastics.
50% faster than
You can return all unworn apparel purchased from our online store within 30 days. View our returns policy.
100% renewable and natural fabric from Italy
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 in R.N. Macedonia in compliance with local regulations.
Factory standard: ISO 9001:2015
IM BioPerform is 100% petroleum and plastic free. 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.
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.
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
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.
Apparel made from bio-based polyamides are free from added chemicals that harm your health and that of the environment.
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.
Your underwear is one of your most important wardrobe decisions simply because it is the one garment always worn directly next to your skin. IM Milk innerwear is 100% natural, and just like milk, it is nourishing for skin.
Collective retail choices have a huge impact on cleaning up the fashion industry and moving towards a circular economy. Clothes made from milk fabric use a recycled resource that can easily be recycled once again and is also biodegradable.
If you follow the care instructions on the label your tank will keep their shape and size.
Inner Mettle products ship worldwide, import duties and taxes are included for the USA, UK and EU. Shipping costs are visible during the checkout process.
Yes of course, we understand that it’s not always easy to get sizing right when you’ve not tried on the apparel in person. If you’ve made a mistake with the sizing, you can exchange your item within 30 days free of charge.
You can wash your IM MILK boxer in the washing machine on a gentle or delicate cycle. Please make sure to wash at temperatures at or lower than 30 degrees celsius. Do not use bleach. Iron at temperatures lower than 100 degrees celsius. Do not tumble dry.
Macedonia has a long tradition in the textiles industry and is closely connected to Europe. Macedonia’s textile industry is the second largest export industry in the country and exports mainly to EU countries. Textile factories in Macedonia are known for their quality and professionalism. Please view more details about Inner Mettle’s Manufacturing on our Mindful Manufacturing page.