Founded in Barcelona in 2010, TWOTHIRDS is an ocean-inspired slow-fashion brand making clothing, swimwear and accessories for women, men and kids. Its PRE-ORDER model produces according to demand, helping reduce overproduction, while in-stock pieces are also sold through its online shop.

Final garment production is centred in northern Portugal. TWOTHIRDS says it keeps production within European countries including Spain, Portugal, France and Italy. Materials across the range include organic and recycled cotton, linen, TENCEL™ Lyocell, LENZING™ ECOVERO™ viscose, recycled synthetics, wool, merino and other lower-impact fibres, alongside limited pieces made from recovered deadstock fabrics and yarns.

TWOTHIRDS has been a certified B Corp since 2022 and completed its first recertification at the end of 2025, raising its B Impact score from 83.4 to 89.6. The brand also uses recycled and ocean-impact materials such as SEAQUAL® in parts of its swimwear and accessories.