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A blend of 80% organic cotton and 20% silk to give you the perfectly soft feel.

The thinly knitted jersey fabric makes it possible to create a running tee made from all natural materials.

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  • ・Organic cotton from India
    ・20% silk blend for extra softness
    ・Regular fit
    ・Lightweight fabric ideal for running

  • 80% organic cotton from India, 20% silk

  • ・We accept returns (exchanges) only if the delivered product is defective. We cannot cancel an order after it has been shipped, so please contact us at if you have any questions about the size or the items.

    ・Shipping fees vary depending on the country of delivery.

    ・Free shipping on orders over $300(in US dollars).

  • ・Due to the nature of the material, there may be slight variations in product dimensions.
    ・Hand-washing is recommended. If using a washing machine, please set it to a delicate or hand-wash cycle.
    ・After washing, smooth out wrinkles and hang to dry in the shade.
    ・Do not use a dryer, as it can cause significant shrinkage.


Blending cotton and silk for a great running shirt

  • smooth touch
  • A lightweight cotton T-shirt built for running

    At HERENESS, our goal is to create activewear made from natural materials as much as possible. After developing our Smooth Wool line [link to product], we turned our attention to cotton. While this popular fabric is comfortable, it's not ideal for running apparel as it absorbs moisture (your sweat) and doesn't dry quickly, which can leave you feeling damp and cold. Thicker cotton can also feel rough on your skin. Our answer is the COTTON×SILK T-shirt -- a lightweight, quick-dry tee that is luxuriously soft.


  • Ultra-fine cotton yarn + silk

    In textitle, thread count is the number of threads woven into one square inch of fabric, indicating how tight the weave is. Generally, the higher the thread count, the finer the fabric. Our COTTON×SILK T-shirt has a thread count of 62 using ultra-thin yarn, much higher than the thread count of 10 to 20 for a typical cotton shirt. To give this tee its signature luxurious feel, we developed a special 62-ply thread that twists cotton yarn with silk at a spinning mill in India. The addition of silk results in cotton running shirt that is lightweight and lives up to the expectations of our team at HERENESS.

  • smooth touch


Choose Sustainable Fabrics

  • wool-T in the room
  • non-mulesing merino wool
  • Organic cotton from India

    While cotton is a versatile and comfortable material, the enivironmental impact and labor conditions around cotton cultivation are also major concerns. Responsible sourcing is important to us, which is why we chose to use organic cotton from India. Organic cotton is grown without the use of pesticides and chemical fertilizers for 2 to 3 years, adhering to strict standards. To be recognized as organic cotton, growers must also comply with labor safety standards.

  • World's leading GOTS certified

    The Global Organic Textile Standard (GOTS) is the world's leading textile processing standards for organic fibers. It defines environmental and social requirements, and covers the entire supply chain from processing and manufacturing to distribution. Specifically, it prohibits the use of GMO technology, highly toxic agents such as azo dyes, and child labor. It also sets standards for wastewater treatment and compliance with social norms. By using GOTS certified fabric, we ensure our COTTON×SILK shirt is sustainably and ethically made.